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 0x72f72b0b7811b72326a2db5c3aaa3c1f2adebc882acf1ba379e583b687e00ef3. 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/7dbc5890-d37f-4f66-a68f-53e1366fe50d.json and https://artists.proofprofile.net/proofs/artist/7dbc5890-d37f-4f66-a68f-53e1366fe50d.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 0x5e94002f4bde877dae03f47d986fe60e9bea5a2d678da60e76b924d59042b27f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USQY51292876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d547523dd0b94aea7b65d639c50df11b44fd5d657844915897f392e32b7a471. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/USQY51292877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e4bdef57db6e521fbaf4bf027fe27ad4d1c871ca6b7c141d9d786c02fb8f76. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USQY51292878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba5d36e61fbd2dab9148b07d68c78dcfdd48a741396e8329a0b50433110cc8f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USQY51292879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605ff189d67824f61660616c956819526c2643a54e8392ec437c55170fbef328. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USQY51292880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5141efebfe541300c00a38498401793f0c20bad9924c636bf9dac6deb8e644c3. 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/USA2P1329147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d57e37113133e305008b1e9a7fbf73d711b3b18c2390abed36c7a70fe88441c. 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/USA2P1329148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467b8a597950159b369cfc681dea11dabb76e7602f07e14426c58ec667c44fec. 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/TCACF1513533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68823883c8183c48243dd0da12d9f925521f2430bebe54a6a6203c1f9add456a. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCACF1513538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6601d27074fb08d2d494c3ac30bc361e00da5c04c1abe99b755878afea6e82. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/US2Y71624003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ab8710c2c2cb3f4820536a48383a72bc8d0ab7b44813e6cf11e4617a3ec5cc. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/US2Y71624006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6601d27074fb08d2d494c3ac30bc361e00da5c04c1abe99b755878afea6e82. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/US2Y71624003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051ca4aef2857b93d75962bfff74628425801afc6ff1d3fa0b48a2e985d695e3. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US2Y71624004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4889b8ef3ed1eced1389468c02906a582d2239b5f928be46dfb742ffa6dcb9. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/US2Y71624005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ab8710c2c2cb3f4820536a48383a72bc8d0ab7b44813e6cf11e4617a3ec5cc. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/US2Y71624006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab441db88bdacced4cbcd92e1b8f33dfb69e3dd4a27d32a03839f4891e3dcd42. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/US2Y71624007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ce070c740da21d125219c06bfe817e7b26bab463ba2fe069118bf386c2e413. 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/US2Y71600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e5c9030b4839bec13e1b7a1f7c3bb790c02321ca800df119f5d99073f03740. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/US2Y71600067.