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 0x0e5a7c7a76446d7af4aaa2cc7c81b2080dd5d377ce298279443a90bd6597f47e. 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/dd8d21bb-aec3-49b2-b285-c5d36486c884.json and https://artists.proofprofile.net/proofs/artist/dd8d21bb-aec3-49b2-b285-c5d36486c884.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 0x1716da6ae1372b6c48cf574ed0d75db950da24edd256835b8fa44a3261414028. 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/QM4TW2078398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991bb3bd2d9c9a2215285bd7bb3a2062f6be020fe35d4986c98af5b181d97ecf. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QM4TW2078399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8949470d85a92495f716b894b2d96384e54eaadfbf8a09b1f701fcfa0eb8bc91. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM4TW2078421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1687d1a3990cd30726b4ee5d02c274cbf2b571b32962edf848812e4ef20ec5c5. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QM4TW2078400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7fa94632d17a6913a146dca370d0e52514266f914585af058fd93f51ae68d9. 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/QM4TW2078401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380314a3922d556561de6af5ebb302b2d64057863ae86b2d1c307e59f8e43abc. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QM4TW2078402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98db51640781ab4bb1b839c4503f2321a19f02122beb40b62a148d58a4ec0455. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QM4TW2078403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844f6e9deb07df94137ea7955b1661f09a03b89ee6950f6537b619f779d8f672. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QM4TW2078404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d473f40172348c0d78214538fe7d5598681cdc7df98361ae8e4e768544d20. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM4TW2078405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d93e0249168bebe307eb9756ec6f1c82b7ede9d48af43177c0f3d58f77795a1. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QM4TW2078407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ffbc6482c69912c5635988b32807949e92a4a78e17a12a5fb1cbff5fd345d0. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QM4TW2078408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac96aa62c89086157015ae8df90c8f3ecded09c2de7e8e31ef6ad8213ef69b83. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM4TW2078411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c65b3ad35cf41b68f9a4383a9c9aa7ebdb84adda7ab105ae8a70c38353fe5ff. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QM4TW2078412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6164c4c9bad998b5a83474c13c841d18b97b6d81e10d9c51d679fd8b3f192ba. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM4TW2078418.