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 0x11c563e38ae04530147ba5c42b61bc8367e295d2526e07b1a61dff8a091d276a. 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/0042bc9c-6ec3-40e7-aa94-f528e6c674e4.json and https://artists.proofprofile.net/proofs/artist/0042bc9c-6ec3-40e7-aa94-f528e6c674e4.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 0xcbc68e299c99d980a6cc88d1e8aae6f50805dc8489df06ff3e9e5382df715a88. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX52E2300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e714e55a249e2e7f0f2259afd8f30b397c849c363dc0d9eaeb50d8b633d23a. 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/BXIV82332740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4750285ff29311e1b6646f4330a37438eb8c006232073e47d15854bcd8bbd7. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/BXIV82397325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d9c9b9ad18bbdfb9e9e5e88ca2c6bd4cbf0888f2f77b621ec0b4d8324344db. 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/BXIV82341693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82adbfd2f80ccc4d600056f8a2146d3a0a5bc5aac27684245dbf71d21a63f9a3. 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/BXIV82344671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d326f18346a7d392a3cc7ef7bfd428b7a14b9f10e02ff4e895051b0257948db. 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/BXIV82319115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f36475cfb07dd6c7c2b97eabd75b64dfaaabf21f32609ed17a440504da748c. 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/BCIOS2300026.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36c987bf76c979d5a0e5cfbdea3d011322187e7e36ade5a2d25194738a50847. 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/BCTQS2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48867080fa05b926a1ff7cfc6a8094f1c2998b4397114fe1575f2a921d3a362b. 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/QZNJV2342549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c081989cd1b9743f1f8eeb6cabc08c006fc670774685569f5c4f2ef505196a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BC6M22402249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc1c4f7d6982c468eff4dd2b58956171f2e42e7ce90d327697db1798875b940. 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/BC6M22402250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaffc0079de9f613e1d6eeb5bfa0d8e4127a0c51d9fb66cc538240d8f78b85f64. 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/BKLPP2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3eb6460f69c7c349e6ed06d9e5698f9537f1dd5423449c9902f5f5a4c803dfa. 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/QZTPX2356698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc638e9378036ad3fab74575b660124ef1b9086002ac6450a3eca45fe8d97f7c0. 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/BCIOS2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf00b7584e6a247f528bbdd904eb934c8ac3c0c28c19124c89545afb6f4de70a. 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/BC46V2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb861989531394708a74defea56dc295ea4892814da2e629f75eebd2b013c5bac. 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/BXIV82328487.