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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf32c58845f297c4be2b6a1600735f4946e27ef5ce364e5749348a259752dc78. 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/229cf85e-e3a2-4c94-8e5d-a0548c90bec8.json and https://artists.proofprofile.net/proofs/artist/229cf85e-e3a2-4c94-8e5d-a0548c90bec8.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a37ae83d969ac7634726a0dc27973b0a23aa20ffea0ea50f50a2d46110f79e6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US7VG1757682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a7f58e1eadc954c47b79dabf4f68b3547a698b2a21d1380d248a727b85fe26. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZ5AB2031254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398377598054b62ef5bd852f6c0bf717b265f9dce5d775735e98d5bd6d90caad. 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/QZHZ31934013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ee45b43a83f10f7990a9a0b2ad66aaaed38ff1c62bad64f98af6bf30ccd7ff. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZGLM1916741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241c69ee23c7185236ce25910354c8dbbe412f2bc3f51b1dfe3ae6860cd7734d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BXYGH1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4c5f66f87851a0ba6fe9d17e405048e8a3fdb869db5b724ab729e2c6cf022e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/BX95O2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8aed3630d89a8184b11cd47ecd18504ead43cc683e87f3ea5ed27807be8d86d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BX95O2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214dc44dfad315f4df27ecd79881440f5e5d8e792888ec1fabd640063178160d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BX95O2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5676cc94b89c55a195d9d8e1b81549df4bbf3e9a9d3906a6b21d9ef039353aab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BX95O2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe1a0b14d1941c0b83a7678719506b4e3a3ca4ed63fe318ac695ecc9c1f4e08. 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/BX95O2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff374ad92696223518c8a415b3ec08949cc8942568fda59668b1902d572c457d. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/BX95O2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac40dd920c8e4de58a49e60ecc1159e0a893c92753a5afd85636452b8b261761. 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/BX95O2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e2443d49e9d58e005123ebfea26952ab1e3b7b95dd572157748284a4c270e8. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BX95O2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a6d6ff3df1285870d4ebdf2792e0a4d6c2be2cee14d4c7cee30dcee5e56f7. 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/BX95O2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5af84508b9b5e93f9844290fc857fa330eae968b23ea54c2a51c4e5d884490. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/BX95O2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35017f30fd7756662fd9c620ab19d3d7485a8e7d91b52ca8011aa02a41f2d7f0. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/BX95O2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3639424a3e4dafd24e20fdcac19a019c8d4638efd7c8d5284f170509de174090. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/BX95O2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2229822d2f25ebf4079e44231b6f625a78707c17a28dafb3c4ed75041bce2c19. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/BX95O2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a4e7c4199cf12713753c9694995760c19b113bfd421af51c3ca3e890b738ff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJZ2430671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb82b01c1b4a601212fa2937a91cec74b0cda618b5f5c47dbbabab08781a4654. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BX9502400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcde0da621276d46d05ec22d4d2634aea0e68cffe8c55918531fb319c3d9c64e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/BX95O2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30357a5c9d69a55db3b97abb50bbf0fd4627e459d61649a2425f7574003c920. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/BX95O2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b707c2374e45b3c58cde3fecea38487f64514e8fe77e57e2d7828f04689555. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USUM72118293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0752b4e2193d867f9558a30f339c57fb702bf364632cf4ff24a7a3b49064d60. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJZ2430755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a4e7c4199cf12713753c9694995760c19b113bfd421af51c3ca3e890b738ff. 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/QZNJZ2430671.