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 0x51bc77443683a583b3b0ab70cdc8a33b33daad1c404f4b10b09c39ae1aa2a453. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5715f7d-a60a-4a57-a834-2fbecff6265e.json and https://artists.proofprofile.net/proofs/artist/b5715f7d-a60a-4a57-a834-2fbecff6265e.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 0x6dc37c91ce2fd8f0e6399e25e7231c71a0ba719edbea1e6eef7f7279ba51991e. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QMBZ92146504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867746b71915ee4b8d23f4cfb953dfe2ec3be37f8da621bbc569b65dc1e97cfd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMBZ91999900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b174f39a6ae1318e5fce146e3d25a29073f2aab3359e934b764b712146c859. 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/QMBZ92146501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fee43b9d4e1c2fd01fbceef620d6ecca0859a8915c8fd1797b43540eeac048. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QM6MZ2144886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e6cf44c0379b4786b9a92d41b695ff33abb64bd4e49609f02fe1bb474cd444. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/ES8622000702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e8671d0cb31e1a75b00b4faec7b7ad352076e2f53c15dbf92c3fcd36186f4a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMDA72168701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4810d8e96e0316e7ad195e4cca2e1fa80bbae07cf0927c3784692fd4267af1. 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/QMBZ92181060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa382f84eb5c33c569ebd71ce2e7ef7f897cd06e9a6a464e1d056f67e911124b5. 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/QMDA62152578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc36ed8d4b3a30bf0a35c1572ac4d9fbc404190cba65d6bb3b03d7d07f36b54. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6N22193127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e8671d0cb31e1a75b00b4faec7b7ad352076e2f53c15dbf92c3fcd36186f4a. 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/QMDA72168701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4810d8e96e0316e7ad195e4cca2e1fa80bbae07cf0927c3784692fd4267af1. 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/QMBZ92181060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac075700368e6d0f7e383a20791dcf136e970ded0dbc90633fc2fb58f00b46. 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/QMFME2102031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5884a65c75b6729897b8a0827da897095a3cb662ccdab95121277aeb93047b7b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZN882181801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f04d9f29a8a9de43e50d7a635500bdb5d459ee306ba68549c5241d8a0541094. 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/ES64E2307406.