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 0x0f08c645cab1b72f7707588e66aca8ca820df148ba78229787b9ebea7e47ef1c. 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/3c80cbad-2c41-4c63-91c4-33e86fad4dc3.json and https://artists.proofprofile.net/proofs/artist/3c80cbad-2c41-4c63-91c4-33e86fad4dc3.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 0xfb7aec240b2296241a7b018ab0d36a121f548d25b092f22f0b4d85f2bbf5d511. 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/QZTAS2211722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2fd5d3f8c61eff695d083138bebdcd5bb6c6d6ca1a6a00906a731f29f07d3f. 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/QZFZ22287838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf946ed4bc4e28c00a2ca3959e3a5319f0bc6a8e4c6064c373e63e55d3c0f7ab. 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/QZNWU2360574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e755d0fe5e14163b97f8d2cf859bd839ae46cc3eba14c098193b2f66972ecc4. 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/QZTBF2389228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c7a9e24654ad01350dea18ab1ce475193970c63ce9c5f9edf9f1fb54c3bae4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZPLS2279942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0c51d95e5e1b41f06dbecf8863cfff0a7f6a33261e42bd40e9aed27d1abb72. 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/QZPLS2279943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44292da92ec9618fb8d3ff18ce85940ce509c61ca9fcfc15ec054162f0f88e60. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZPLS2279944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca6552a123d1d1c1d8388e932d59d6a33ea437e3b53878d9ca4ba2c2d9f7051. 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/QZHNB2189025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4f5fe31807c2c9039a771d933d15f49d101a52fbfa368c361cd183a7813d33. 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/QZHN92100950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b844f1b2fce0463908508fc6e82f4e4cec8e813ffbe8bef7648d3bc688fd26c. 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/QZDA42190533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7453f848381e1594827409ef6accce8d510224beedcbeb519015cbc40ba9a05. 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/QZES92092994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f0cee5095ec78b5ae6575517f4effc473a42001204026e6a2b729657043756. 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/QZES92092995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6eb8a61d55c65ae83195ec1b45421e7c1091a18cfbd7fc3e4714dc7c5ed9a7. 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/QZDA72087765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80ce123a7492fa59f33c0c1fa0dea9d0e9c0d5a45d6f91df5f682381007a6c1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES92092996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36e79e2ab6ff8b799fc16874f7e77395ddd4c7e471011b503b463b519cb2473. 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/QZES92092997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f578693c7662dedbaee1a64cbaf809660c82977afa2fd89710b85290d7a140d. 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/QZES92092998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf946ed4bc4e28c00a2ca3959e3a5319f0bc6a8e4c6064c373e63e55d3c0f7ab. 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/QZNWU2360574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6a61b83fb621b9782df76b7e0d67f521e8152a5ac52c4465e21f417d835c90. 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/QZDA82353208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b22da04832ffad8451cdd4fd72eaff3daf273f96a9ea18cff89170457691640. 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/USACX2200538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911a58a6084dbb4c0d192f1d794600ad0a0ccc00dbb33e8e01737beccef26cae. 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/QZMEN2233938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661dfed0125b9bd420b4b89497dc15317a26341ffcebce5453861e1d9a9dbe49. 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/QZES72287054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca763956532c46871847729d76320616b81355573bb0d0567053810eb7ccf21. 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/QZHN32158972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9db23b31f7dd26e88bf51db6d4a3cc924866da25db422dba13efe40ccf1b94. 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/QZHN71935358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83daf47c854e469aaaf0d939c72e3e618630e0ab054f1be0f2b408d7162dca39. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SE5BU1928182.