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 0xc0913a9ab92080b53a811abb37339ebf40526160ab217033067c47cee435073c. 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/8c2f0742-33b8-4882-badb-332b6fc5db12.json and https://artists.proofprofile.net/proofs/artist/8c2f0742-33b8-4882-badb-332b6fc5db12.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 0x329daf4927361c97064ee6dc169df401665055fab456175beff294d709577ccb. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ESA011802684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ca979d4e87bbae275b52c852e06d2eaf7fa7b53c45c7894a4cfd745a5a3d8a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ESA011804253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea811454b68f422d81b467b70d1b7da2ed9ddf2b6a73a0e947b7a7933e4773a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ESA011810398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd01252fa87beae04e949296f34217cd8dcfbb52dd306f479b93d8e48c09aed8. 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/ESA011813712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0dc2388b5199f120e32d00653e11ee4c9e64f1e2ad97f55fc838981789b06b. 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/ESA011818028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4bd663f2dc1301c9c6bcb0d2aecc6121b84cf0cca4f25d9c204f44067c6fd3. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ESA011937989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c73e4cde0e82d0045abd81a034ba484f197d8976b6b540a8be9ade9de62474f. 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/QZHN51923952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a746205e0c1b320aa14d516a47a885422cc3c05ca75e600e0bde0f9493cb95c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHNC1984427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9fec952d64729cda24bc2203093ec487db2c1b525f17c5767435c6360b3665. 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/QZK6N1985221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118179d1cd964e3e3adcfd4b861a98cea886cc00de49b9b0e87686e43cd85bc7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ32037466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a49e2090b8c758405744590f9c0aa481d36d934c13790e7a21b32eab6ad5b03. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ESA011807532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bf7f98ad15232be31d21cfcb4302eabe3c8e6afe0f3699259fbaf1717c399a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6N22044687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf578c6bdd33938cd6444282d66fc4b41658237a46df137d1513e6b98190f8879. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QM6P42071486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f60671a65a085a3282d1670da9e98f9b57ed85496dfc6d3972ccf9a211f5032. 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/ES5052200145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784afd3606794c5b5c1945e128cf1990a9fbb38264b12a615f79994c43021cb1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES5052300365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05699a782fe376765ee221de402b85b1c947614ed3a409306b8c42e064e812dd. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/ES5052500091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc4d870e0cd2d7354957f53377c38d1684c0595a185b5194d01ed427f2f7689. 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/QZHN91979677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec970a5a5a8f05049bd5fc4aab5460079f71ef12003072464c3d770b0151da08. 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/DGA072278952.