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 0x5685ae9625cb0fa16f46227106a24b386c9b87d308373730cb4e341a2b6098dd. 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/5a99177f-67e7-4616-af18-3044b5614e70.json and https://artists.proofprofile.net/proofs/artist/5a99177f-67e7-4616-af18-3044b5614e70.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 0xb189fafb322d2f845be7faac5152563a0709f12e6413855d36d0bf62496649b2. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZGLS2241765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc079982398e71a811444e39b5296258e9676df149bffd73c27acea2421beb486. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/SMRUS0072373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec1d9788699f40291ce5239a75f0d9eb28dfd4fb1ade1c602b0d29187ea57f7. 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/QZW9N2255531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58a48ede3a29019e4d16dcc2764e8f88e7b5272ce7688bdd7fae87f392a82dd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9N2255532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f02b2d88f7e649f7ee42ff111d94ac4f470baa79554c6e06729141087c85fd. 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/QZW9N2255533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79512c1747acf55e4494152dbe25ecf4efabeea91292ea032410fe7000c3a71. 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/QZW9N2255534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1380f5d9706977f7d35cddb4fe91d57b353e6ec6418d2cc5cb381f88e6118f64. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9N2255535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eef1f1acb3c71869c35db1a6d1d4d66d1968aade1470702db64ecf15dfbae14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9N2255536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1366ba0496ca1d54b15f7036ac8f1dd56dfcf9256b7083e77c94361ff2377e65. 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/QZW9N2255537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001bd4add26b733f0501bc4290c66ea2bbf971f96884806df9f4420fead12087. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/SMRUS0074853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec04bdc3edd25369d1cc853173975053a568aaa70543e97f8f84e59ff1d2a754. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/SMRUS0076603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032748c0f4a7fba03eebc045aa5a9cd50f5bfe0e7b12a518bc3925ccf03a1265. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/SMRUS0078203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2b3eab5aeabcc8aa6150a869d8eb77ef99a04a4f118ad6a8d46d935dd08efb. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTPX2494308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c36865f35bcb717b6b75e0810c39978643b98d23156820fe28194358506cb0e. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTPX2494309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fd81412ae11aee397b0fa3a5c51af574707a222d04df3a5e76b4baf8df44d9. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZTPX2494310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283b99c1512676c22d6de2def2aac1c33bf68fa723a846b1fd0434e28e363810. 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/QZTPX2494311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd806b4881ea92d465872a7b9c00f6e0cbab4acda264b0c1749bf035cd3ae73. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZTPX2494312.