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 0xb73d4b2e8c4445551fa79c4ef50822b80309182b9cc4f3ea193690991d82d002. 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/985b3c26-c809-4ad7-a929-3f91d07dc18c.json and https://artists.proofprofile.net/proofs/artist/985b3c26-c809-4ad7-a929-3f91d07dc18c.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 0x31cadca4820a68d9f7faaa56bc31ea2ba1ca05a7b191dfebae4d9640447874b7. 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/HUA320000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa718799caa3477755bdc30b6a387ad761e89869d08b50913103cbadcdc5d5dea. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/HUA320000153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690f9b739741079e224086ae64899c318f708ddc3e585f0c3fb2ff86dbc3b326. 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/HUA320200092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1954e37e51ba3ceb55456a99e37f92165e7e048345c7790708ff8666d14831. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HUA329800200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ca18539bb7016d7d91f54665d9a2695c1da20da3e0392b0b0fd680fdb29f73. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/HUA329800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b126382cab769d4f403cddd63a1e56dae8df671759f6d4200fdc6257c14b29. 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/HUA320300215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d5154bb0f2bf36058bc941b81d5e3f7565c9eb0a15ffb1e0105a4d201a2597. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/HUA320300223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d60cbf6343567d44ebdecf2b6531a95e618da652fce671d58dd12f4720e27c1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/HUA320300228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2205de3807bbbcef7af3d664b2318e6d2a0e0d4fbd87e750008bdd0ae6688e7. 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/HUAC61000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b1a73c85deb6026b7e1ca57d839c1f7647778178106d8ca73e36f462cecb22. 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/HUAC61000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88767118e122d564ca12c37dfe5ef59941dbfbad6ce82b63d197edcb6017ef1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUA612101828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beeb95e91d092ef04490a2e38b675fd8cce6335232e848e592342d698ddfe25. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/HUA612102015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9398ea8473d9f6d50f26ab217ac61eac12893944765c664089edbd10f104fdbb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HUA612102061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52168c8baa7d766cf926275a857a8c9868fd244d89563406a158d23454003de9. 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/HUA612102062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdd14310e907fa66f2ee740980205d5a96b46903365619a7afa2de67d0317e6. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/HUA612102063.