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 0x199a6424b85c61450f4c358c221562b0f403714a2e0e10dbe1dbe13fd705335a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca820407-2014-4eb3-b415-110ca494872c.json and https://artists.proofprofile.net/proofs/artist/ca820407-2014-4eb3-b415-110ca494872c.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 0xe322b188a89eab8a968191a2af44318de9d78be20b331d169b00a528933f24c7. 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/TCAEC1965418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3192cde133630da2d13339a31e3a9468962c5f4ec4974b4e5a2254197175a1d. 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/TCADY1832097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd6d3a12777682cacbe3b99dbba5023b8d932b690f383ccffc70cd2bb023d43. 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/TCAEW2076687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499dca6d4a444c549fb7a9b49ed063c56b1043d1aeb864da081600c951c96b78. 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/QZ5AB2288606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b1728aaed815d5d7f0edae4934e20c7b08098a5194eb40020f0033d3e103b8. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZWDD2319414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2994125702e44539b801e43117d335cc9b1ba54ab59056b88630a73e47e93fc8. 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/QZWDD2426336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b1728aaed815d5d7f0edae4934e20c7b08098a5194eb40020f0033d3e103b8. 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/QZWDD2319414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23dd02aef3db9b2bdba0611a73dd75fc2c050446b347d43fc640d5df3e531e47. 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/QZWDD2319588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15f9daf3f97ca53fc84c82b4ffe310f8178305d3ec81d6bc124949c9f9a6641. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZWDD2319701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a0449bcc1cb2ab37251b3821561facec20b38111cdcfac1bfe168ab5eee5d7. 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/QZWDD2319708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12307344b74d25aaeda2c7af634de6e6b065a17b0bc80fd6246d39fe5bfd842e. 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/QZTVM2263405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499dca6d4a444c549fb7a9b49ed063c56b1043d1aeb864da081600c951c96b78. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QZ5AB2288606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d23d3c243353d89b29d7b2acd0b5e124530467ee348914bfb46f7961070734. 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/QZ5FN2433692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5311369873aa0cde478dc1cadb978dda3dba5afe7cbd676c3181a56ceba9fc. 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/QZWDE2407126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389c5a1708fba5a7137ac276e6187e7e0bddab5fb3ff27829b4b1b3815fa7f59. 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/GX3Q92412742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b244144e6ecf4f7f7aacfb6550cf4db96780255609f5518ec06588fcdf3b63. 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/TCAER2010914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb649d7945d051ceff24d16953391a8e6f2086e88eae78beb83f773d8e71e9cd6. 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/USCGH2407238.