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 0x7a52d431576481f82df6f1cec86f9cd77ea21900c20702176b03dc75ed4a8d7c. 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/b94deef1-bf8f-4745-be41-e182e5cf482b.json and https://artists.proofprofile.net/proofs/artist/b94deef1-bf8f-4745-be41-e182e5cf482b.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 0x0a842ec7428560fb0720bbb5bbb0c063cd49fa92f3182c3d4fdceaa9fb41d3a1. 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/QZNJY2517982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1095bec8a1a03927d3eaddc80d61f2ef418ee63fc22cbe74f3a180c7df51fc67. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/US7VG2530737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360619b88e19e1b2fd68805955ec4876d3acaa4767ae55e055f2b963b1fdb1d1. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/US7VG2530735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072a3c0587dd94a5ffca6bf97c6bbcc9ac6c60b18fab558dfc1678221f6c3fc8. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/US7VG2530734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8bf34600c2c57bc909b75018a3506b51cbf6130a8d421b65379a9fcda9c3103. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US7VG2382443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4ea7faa5acfc79d9e2fa76750750bf8fe8679b5910b9e4ac02c4fdaa35261e. 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/QZMZ92432625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7734af9b895ce496b6c6b9e854836f315bde3b834ce7d14c4ab76e96784c9130. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMZ92516216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf602b3b927c1ecbc39ff60b26964088792f534e7496fdf028c53cdb96eabcf5a. 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/QZTPX2435953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697a104f362ac423945ce48de5f5dc7dfb2fcae5861a86f7e7a754fcc6052351. 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/QZTVM2459105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dd93250c3a02d0809c3b835566e585a08ea925d0e35ab94a2a0f1f98e3b378. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US7VG2530733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aefa0d5d4af279c7cdbb1700dc619d3ddfff316e36ee3b78366e20127de89fa. 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/QZGLM2427612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4658562a9492228ee1e741a56c8787b78860c2721871126668b148f7c3d4e335. 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/QZNJX2402073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1eb663503cee4dec299d25a79325e37519c0775b0aa1b42b66318dba05f499. 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/QZMZ92354337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca52b64196bce7a69b510c3f7319f1e3b7aab82e3fe7ac1b43232c4efc208227. 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/QZW9L2436287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe829ddcb0046c3af6f441a73579e8abe5f9f5c502dbc552d7e7dbb9571ec703f. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZW9L2321394.