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 0x3d02426a5e36d25e08fb5e10d5834e9a4377efc5966eb82dd81e2bcde18b09be. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee1a93d4-08fd-40f7-a0b9-ed610b32adb7.json and https://artists.proofprofile.net/proofs/artist/ee1a93d4-08fd-40f7-a0b9-ed610b32adb7.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 0x97b0f8f2c6415486d135fd380eb51ef8d6a0172e4827060d828c554459840f43. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QMBZ92341732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464aa2e225fba2f12bda3939178ea2a6344e5022b89f4c4feb33d5d289d59661. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QMFMF2310989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61506ecaf5409a612fe00de7c9cd898b104760bc2dd606f0a5a8377768dac88c. 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/QMFMF2310995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a34b2be29d65797943338910b8e7ae14acfd3ee2cb7d7518613ce3ed403995b. 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/QMFMF2311000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383782831f1748bcb215e9796f2a0efdd4001009e81af02561daee843ab12376. 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/QMFMF2311003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb351b7a2196d9261e01940d087f224c5a07803539c669a165b1d59dcd5cce0e7. 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/QMFMF2386995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f97bc116c39e8637516de4e7fc75b033d4d05b5ddeaf3d379c85a34a95c63f. 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/QM6MZ2417090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f97bc116c39e8637516de4e7fc75b033d4d05b5ddeaf3d379c85a34a95c63f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QM6MZ2417090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e2ddab34492391e3df9f91b1b7a4c631c42f5bc7443e33155b5cf912fe1057. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMDA62454751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dfbdcdab53b82a22dbba3d641d5b306582d11a37b4c8e6b66742f092e1b7f1. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QMFME2445200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3eef76a9118646eda385b4f5c00a49ecc625d13d04b0e37754df876abeb39a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QM4TW2517659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb92594ef1fb2fc4e8aa4289d2b4d652e74e821ff227550ae30d7faa693b7acf. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QM4TX2583407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3fcdf6bfaad8500ef8bcc0ddf7f3c1d73d070c03b5a3a54c546875fed1914d. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QM4TX2583391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ed8054bb5ee563c68238a97a7fb9dafcd22eac25fe2cab76c447dc0b2b98b6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM4TX2583347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a561b78fa0e5a47630e5f2f9ef4cd43473056c33ce8ec2dfd103b54e8755bea. 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/QM4TX2583389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6cd69e328f60d7683d970f2f681f379cb227984cc461f52b1644af1aa2a47f. 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/QM4TX2583396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ad6ec635bd6abf61d784ac3379ccec51cb792d8c6a1bf962a4496ce217f050. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QM6P42564735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f640228070f897280387c2973b3e4b31fecb4100cba207ffe823b7f876c59d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZZ8A2583093.