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 0xbdde3cd040fc19faaa0c932d93068c5c2e60752d9dd264ee10e96d1bc098a373. 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/efc72002-2e3a-42ad-ac1e-c48a8a4d6a83.json and https://artists.proofprofile.net/proofs/artist/efc72002-2e3a-42ad-ac1e-c48a8a4d6a83.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 0xcc73221fa86c77237c400f45fd51031cde6efd19613cec9cdfee59b18581ff0e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CZL752003001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34e51ee5c69ff3bfa8ead9e27586af88f78f7ba682bf9c4064d6cabde9209e5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CZL752003003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5212fbd222118ea382e6486d39839c6444d1b8cf2021ef4573d54d576c4829. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZL752003004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52844d4308a52ec8b68aef03eb87b3c6563913f63d7deb0fc5c19ee47250c57. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CZL752003005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef3d6e8da67051792a36216cd21e366cb9a45903c6712f39617bc6edc9cfeba. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZL752003006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a9aafa9bc7c32292c1ac8902a1b1a2e4d52f3a8d70348438e8c24f145f4045. 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/CZL752003007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8dbc97b309eef1247dd33e774d3cdeb4d8714c031ed75c46b14fb2527b328. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/CZL752003008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a3b542aa1ed1eec15858ec8a09339afff6c7a50b20b5558a01116ffaf175af. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CZL752003009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5293ba92549fe5b3fdc4662456b369c4d90c124c133c96ea377579c46ac906d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CZL752003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1845497c42ba3db0d041d71f85c119414d836a7e79f66b5ded8872777dcc3b32. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/CZL752003011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1251c8ff12dce915e2245c3ed392b8c60a6eb8f25d849f6c7479e18584e8d55a. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/CZL752003012.
Nepovídej, milá, mamince/Kterýpak jste který
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38fddffe9cd70d54b7ad5a42e92882b8f928e639eb294f164ef3950ef8df498. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/CZL752003013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb32f56ed69356e1d3bd5af49287336d1a3b4e7910b84e5388388e7c710ca4c6. 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/CZL752003015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf5ed81844203d7f8eb15f58e14324c21b31009deac68878374d553decadd67. 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/CZL752003016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e60c4da5a8f56425fc252eaa63e0301568bd0252d62fd3b31d1488e4561ffc7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZL752003017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0525cc094c89719cc225dd27e45ae10f142ccde9757840c07f31968f230a673. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/CZL752003018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52bd3eb0cb74291a690a62faf77107db48c6b07ca26d9d944a182b6bba9edd2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZL752003019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf493eff91477e009be98cdf1ff61055bb246d609950d832125daf9c8a33c638b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CZL752003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74842f1a47f71036ffcbdda37852cd7dc83377d43f3c082e890b6ba9238873fe. 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/CZL752003021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe606c9e85f1e37c4e24882f1de6324c7d13afa9902d9a98a1266cfd94fad4c6d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZL752003022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18434bc916d1b8f8003d3430261cefeaf9b98d07de13f770f2ca84ef0b42286e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZL752003023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b80c78a3cb47c230765fe26f00cfdd151638cacdccf57688f5ef46dc17a9ba. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CZL752003024.
Nepůjdu od tebe/Tam u řeky/Ani tak nehoří
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee47477baad7de86f2702052f78961410d5b23b11d0959f24e37bbd19c0a7f1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZL752003025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d7da9de606880564f25845a6daf7a4a341a9fd8babfa102141b5e10afa0a15. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CZL752003026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158d01e8d421aac0a86d0ba29fa0a06fe65a0300aee40f99de18517dd2a31ca9. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CZL752003027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8519fb335858206ea0b2d23a454c611e77dcdd0c1582923f2cfbd0e1961723e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZL752003028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a3276c9482e4d552ba8beebac9f99005b8dd9c466cdd58ba83df37117aaf39. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CZL752003029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96f6c4650ac2534e0a9e83d6bdd2a2fec8de95bfb4fb81fbd98833e35377664. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/CZL752003030.