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 0xacb5fd9d2320c698dbe95c79ddebd367b0f9b7d0f2421520ae46384f939557e1. 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/1037edca-d87e-4caa-b1be-2f9fcfb269ef.json and https://artists.proofprofile.net/proofs/artist/1037edca-d87e-4caa-b1be-2f9fcfb269ef.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 0x23c351b66b5ace94ab8abc27b4e7602aba00570f00c2ec8dc1d05a7559096056. 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/ARBLA2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31624d8c750347abfd666437cde33b424eff678774ea030268cc8e872fc21400. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ARGWA2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa309835be7dd2e2e245b59d82899b4b919cd0eb77b9944b353434df5da50af76. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM7281999130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283c547ae2d0508172c6fb9ea22db6bf3f22d4b3992960056c1efa7522521936. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARBLA2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5561695ec976a763c338bdcc37073dfb3dcfcc00622a2815a4668f284f6a31. 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/ARBLA2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3f352f1f6af6127c15c9b223838e0185fe2efa76caed914700a64b6a6c8896. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ARBLA2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b391b20773bdc1ba9c2aa7a26036a3f0f5e9fff98e3b700ff28f421f8cc1b8e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ARBLA2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b391b20773bdc1ba9c2aa7a26036a3f0f5e9fff98e3b700ff28f421f8cc1b8e. 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/ARBLA2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3f352f1f6af6127c15c9b223838e0185fe2efa76caed914700a64b6a6c8896. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ARBLA2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3906909a8522194ea5e3a5a3bf1530bb93a156db07928ed5c22b99d0aa62f4df. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJX2235585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ad5defcf84b939cd7614f48551b43e21480f85a697e3bf80d936e7e8ec8562. 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/QZNJX2235586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4165405f34f37df93e57c349ae52b212e52df63784cac19c682e1e793bb0ea7a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJX2235587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd5bed430f1c69040abc1ee2ff4012b00f3f0abf7428e2837d34d89bbf2c75a. 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/QZNJX2235588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145226a96fdad4313511e35b0def4d6e3c0050806ca17899e69f067a27014b61. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNJX2235589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7bc36f6a06e7f98f179918d0d5ed5d86d58df25ba56c9b357a92688d6b52e9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHZ32121573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47d356882859331041b2e5c7c34d3626c976c1e7df67e9d27ba42728bd3d9bd. 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/ARIXB2402229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42966e33bfbb4b50f95dfdcc53227f31c0300bd9f8ea750ec41028eeef74679d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJZ2159696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c351b66b5ace94ab8abc27b4e7602aba00570f00c2ec8dc1d05a7559096056. 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/ARBLA2400018.