Bendeniz (born Deniz Çelik; 25 July 1973) is a Swiss-Turkish pop musician who is well known in Turkey. Her first album Bendeniz in 1993, was a great success thanks to a song called "Ya Sen Ya Hiç". Sh
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158229cf91cb2c98732bf2af8974d6ced1ffc8fafd14df01f8ea26a6f54980be. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6e50950-91cd-4cbf-abcc-48805446d21b.json and https://artists.proofprofile.net/proofs/artist/e6e50950-91cd-4cbf-abcc-48805446d21b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe2fd0481894404cafc4fea36d564d3c1b63909c8ac58c3cf6fb370fa6f8075. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1540600261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12582fa03833e2fe480757189a471a79116d53538c6cafb92ef95f744b9ebd62. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1540600267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8987555b2cfcf3025517e4180a5d8d6957a9fd9fb3f659ff7621f64fbd7b9543. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1540600263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c460fdaeff0300785ef8d24aa26784a3a7d76afb8de6754feaae189cc980d98. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T04:55:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1540600265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2d0942da93436647402f0f956b794ea5b8d44268ecd61aa81ac48af695b77e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1540600262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd2ebc0084c0ada272bc41c7b999ecf5db49d3ec68b6a7219a7c2ff05a14f8e. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR2780300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbcfc07f7d2f5b02d452a48aab20da85dd7143144c22d0310abf69dbe983c6f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR1770900088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5beaa610bb830203adc7c66383c38068d830018eef12e4e068df7637437d7437. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZAPG1744899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe936d9933aeaa0cf8bfda51a5779bac91dee14ee1793ecf2780806b2add3bdf0. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZAPG1744900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fdb3c6714746e8ff4308433d3a8b0928e0a2e09e2c3644aea82ac9fce4f79b. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:07:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZAPG1744901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dea6547f947206ba1c02bbd914f7b15e087936f81b097da31d8af6579780c0. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZAPG1744903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8f62c3e4e06547cfa1410df23ac62df328b0424b48853fd996bf2aa1162688. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR4591102337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1166697a5164313073aef931e1a408f5f6984b4b248e6718fb5c382be8eb819e. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:30:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR4591102336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed6b0e9073780b4f69e6f4b107d5fb03766fd9f9ec7ed97ffcf21d2648ef01e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR4591102332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8df54e7e67febe7280a37b75c347670f13a5d0daa9e4c0135b51d6ad43c518c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR4591102327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb167a41cf2eca941f218c7d84eca52e5698121ed1ed212d25f047380e4e9120c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR4591102339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a00f986343b18286e790beb8a6ad452a5d95de909568f6d34b84a91da12214. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb4ad7af70e4e8b1d3cbc1772644594331675b8bae88b9cf76a273ba45d6996. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb4ad7af70e4e8b1d3cbc1772644594331675b8bae88b9cf76a273ba45d6996. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:59:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2961be7362b05634ef2e46ec94621448137416630c76e3475da9154dd33ff687. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc99cbfee3711d58adc3139ab806c8f5a795a2be741ad63ef980ff5b3fa274c. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928ef15f9eb5e0740dfa8304a333578e3635ba17c756ca59ff098ca3b11c2cd3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2961be7362b05634ef2e46ec94621448137416630c76e3475da9154dd33ff687. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc99cbfee3711d58adc3139ab806c8f5a795a2be741ad63ef980ff5b3fa274c. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:50:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee40109dd717af6f976aa2ebe09d2e0d1d9fe5ad202f8ac3a75b9a1b52140f8f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301695e8ae3ef0b914aad0e285bf0e6440f23119a8b77d17c15716a9c81d4e6e. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b3220870e018daa4f700cb706defdb7a3efdfed5e55966927d8f9d841f8e0c. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880d99c751eb023dfef39e61d266b618703531ff3871ae11b7cd15d69bd0c23d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145d0b0e980cca55ad4dbe01d46e609b8af0918d66392460d1c1a97d34d002fd. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301695e8ae3ef0b914aad0e285bf0e6440f23119a8b77d17c15716a9c81d4e6e. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T08:57:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b3220870e018daa4f700cb706defdb7a3efdfed5e55966927d8f9d841f8e0c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880d99c751eb023dfef39e61d266b618703531ff3871ae11b7cd15d69bd0c23d. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145d0b0e980cca55ad4dbe01d46e609b8af0918d66392460d1c1a97d34d002fd. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:16:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a571d795147f8c4995e5f464b7f7e3a07228de5d03a535e3cad37a73228ee6. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b88e2b06efdc989fab10847eccfb6b32f74cadf1bbb3552407c7b309582d10. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0392300404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b88e2b06efdc989fab10847eccfb6b32f74cadf1bbb3552407c7b309582d10. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0392300404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939edccd484394de422bf16055ad4289339cdc163b83f154f1610ecf15a0f148. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR8701100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939edccd484394de422bf16055ad4289339cdc163b83f154f1610ecf15a0f148. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR8701100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e34672bd2444f490c1bb1574f9aa40fe488f5011a9fc0ac56a059fa02364a7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR8571000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c5c022cf59ad586a618792598c78a08394b62c52f2617fa1bf9db12fa12487. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff11549b401f131e7a2e34dc097ff1ec20a38c057ef75e78d59c09ca6ae3b1a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae38195008dc7830cc3e52c3bf49bde7dc45af48e6ecf6995346fa95523b82a. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0391800263.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch