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 0xb0f12444b2e60a481033f98f07b843d78d610ea1ba8bacd5133295ee13ae50dd. 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/30043319-6180-4554-8b5d-9fcea52857f2.json and https://artists.proofprofile.net/proofs/artist/30043319-6180-4554-8b5d-9fcea52857f2.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 0x804e1646e6c362721ec61c6c4ae4903043ce88d6c748b430a7cd4bb61ab5936b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USA2Z1810065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df54b309a12b2aa37c99c4ae4e85de366b0e67adfd49efc594f02862a81cff4. 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/FR96X1908663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe064d1bc0e859323e9162142284966b756d8eb8f524324f6e32de382ba095c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:18:28Z), 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/FR96X1908664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ff7c6723addbea30315cc8a49869364a24fa3068cec7b90c975922e71d0409. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FR96X1908667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7507f20fea2bef6088c9a61730549c8c76479c97d0d556796aa47ee9482f181a. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/FR59R1967221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f361be15aeaf6c73d39cb05b9327d59575f2dae71641260f54845a384792918. 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/USA2Z2001611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284ea7c6c3a37429c1c3a762635caf3523f795e3ca048f8156993a7af0692c4b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:03:54Z), 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/QZHN82102467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ca7244c51b53be9fbb763b539db86ef42a88fa8d062e6f94c82f799a1a9992. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES92179943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cfd1a824717f8655859524201b530e6dcfd15a92cd60e3af04335d6a77de00. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/USA2Z2101424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9197fe688d589ad3fe92e09a183fd5ae505e07344a9e2cb71c590a21f1e7612. 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/DGA062349178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879bdd3aa870c24705f99a68ddd7772309916239c54d97998b04ff00f1be322b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/DGA062349179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539423379ab7521d4a6d3a8a3a67986d6153812e38bf8e28e3c5647ced453b49. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:35:19Z), 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/DGA062349180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a478d33cb24e0ebe56da9a6f4556b4af30db27107919b9ad4157180a2e9f2d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DGA062349181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1311d399562a595a9a0cf9f6b593ea8dae58efedd4663c6a12702f9f1817dc. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:39:40Z), 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/DGA062349182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae507d95923fba41b940b50e1bd7d6951df8dc4001e80fa1b1d253e3e5b90bd9. 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/DGA062349184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac20d9a8b8387edce44a542cf942ffd93853f5c22b5d3eac9cf63813c4070f7. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/DGA062349186.