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 0x29519ed9e739429f04d1674b2f3b72ab7a5edeb4f206bba57349189552641896. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e517b979-c1d5-4e27-8a16-4cb64e26a06f.json and https://artists.proofprofile.net/proofs/artist/e517b979-c1d5-4e27-8a16-4cb64e26a06f.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 0xc4647a941feed38e41663b458741751413d2b569d40e77a7d3b099852739365a. 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/QZK6P2543169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885f00ccc2c400cba46c6a073895ad2a9137fd3ab621448104d269aa6860d238. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZK6P2543171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc128a012084daf67d5a051076d7c7c7cf035be42a042162568a2c6fa2485b2bc. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZK6P2543173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a35523fc7b129aa27b6bfdd3959497162193c4c85e1fbbaf236376210455454. 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/QZK6N2598953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a154aedc75d2db1165b4ad2f61a221a3621d82d7df1b80b13078b7d59dc828. 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/QZK6N2598956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b076f286eed9c7cb295ab2a4bd3d8b26a2f9cb7a0c09ec309970de67cd058a5. 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/QZK6N2598957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e206e831033343c5caac30d4d7edca4247081fd82fca56c91b328ba9f8db39. 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/QZK6N2598959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb377d8fa5b70a6ffa5549bab83b8870b143ad7603b6c55ada91dff66fbf33ff4. 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/QZK6H2569933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c208e07321d9675f9227dce001212cbb686fd13f84ae50522d992102997f1c. 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/QZK6H2569934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2662cf05f71aa3b549aa82ea6fd616a1922dfd3aae36f3921e3a43bf963b0ed. 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/QZK6H2569937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ecf20197acc79b6cc7eb59cc7245f66a3872e1ba8a963256671b56277a971e. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6F2537460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1c432d02ebe76a070e8522f541d6df8cdf3bb5805588c33fb44940d43b9c19. 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/QZK6F2537461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab78aa8c0cdeca097a83b060076e7dd52ed7a50d137e65d849cd0ddc0b41006. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZK6F2537462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47837063c86feb37507a6e3ca2b196ae9f9cadd568266b06a8d0e4343af14866. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6F2537463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918e261bbd2477955caf7a97d24ccf612254b1323667ed24cf94de3209895103. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6F2537464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806590a53e6b29476a60957aea3fb95dbe70150380c1f0486e6cdaffbb4430e3. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZNWU2588928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107b8ea9af9b8fe2a9dc1635d7863dbef2b28c0c79e208f289b7c2ad48a7deab. 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/QZNWU2588929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c0d5c8d70635e7dba3ea919a709be41dcba8893b3c6ea49fea528227680aff. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNWU2588930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4c8e83512705352666bfcc9045687c9dd41d4658a6e78b01a2574abd3f53ec. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZNWU2585167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76c57b7720384d423a9bd85fdb8e4e9e28dce83dc8c744fad255b0a0e0d0c16. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWU2585169.