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 0x96a4c7cddda0bef114cac5256c6c3beff2fc1f9c909623ccc876e123d869ff6d. 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/1e6428e6-a465-4a51-9e45-ebf21948033f.json and https://artists.proofprofile.net/proofs/artist/1e6428e6-a465-4a51-9e45-ebf21948033f.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 0xac6f906d8934955bcdb6293b4442546905095cf6dc786d5d17b91878fe565db1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USANG2149723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183448a5e7a62fbaf4228728e6d3bd9b229258642b66d50c197b96ae747e921e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USANG2149724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942baa3039b2ddfbd8e8d9b17d2f00cee82791db1cd0e1b2404c7e7ba424e28a. 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/USANG2149726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75de8094a62b56fa1ca0254311ac4a49075737975c2afa10ae4fb39f9b0da67. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USANG2149727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffcfd61734d724765d73fba263acd8b63cfe5fb275fa07908538ede57946629. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/USANG2149728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633fe5c9d9b167faa76b9be1de865f5758e37ce4da676d1ed7d4dc07b4441944. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/US3DF2225658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92af4b019dc3aad1de75ca0a4ff3f3d92792f0869eafb98e12495d53c03617c. 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/US3DF2252958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc96149ca4dfd7c0f958a2ba1c56163d876116ff2982bbd5d580543b769e7db. 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/IDB832202142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc137398444558515f4a15e424a3102ce5d57df0f8948d4a9c8d8462a5c4b6562. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IDB832301518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10eeb268ad75ecb9e19e0bc98f560e968d28a1eb05705f7ca6a1ccc80ed5c572. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/IDB832301750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea41ef950a82c22eebe4f51403977536bce543105118fbbd783d4356baff58fd. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/IDB832304271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb714d9b67a830223ba36a9d190dc110a21d2d364bf090b2d580aa481f156c57. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/IDB832307724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09dd5c59fa7812e477c0ee8a8418af67dadd4e49f28edbc376ccc8e7e5cad16. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/IDB832402562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3470c6e42491d5d290c10578859211c9b134b4691b66394a875cbedd33d18ef5. 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/IDB832500204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5d846fd1a1d16c890005838aabf2b6c196b064085428d4870e78fed308478b. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/IDB832501808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0c03c2d700ead3764ca0c3529f26fee52532b9797d26a27197d39dda838476. 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/IDB832506907.