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 0x4ce540e6d525dfe6d58526ad691a3f2fe5a562dea456087f970bb20238b24aed. 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/5d9e6cd6-b2a1-4505-afc4-14a790d0e823.json and https://artists.proofprofile.net/proofs/artist/5d9e6cd6-b2a1-4505-afc4-14a790d0e823.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 0xa3631cbab574fb1a12d843f27ef03ab5bc6b2ae2834bb6598fdd7af6e50dc514. 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/ATCW21711002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf19a1f6a49d604d6305801debe834cea18eeb03ca583555790eeb8e56985c. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ATCW21711003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2929a2053b45799c3991db5476f09553385531fb626cfa4f364b77d96f154852. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ATCW21711004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a85f40b76c1d9233a78394559b289c1259b85cb9f263085c97d745cd925f6ea. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/ATCW21711005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14718873ebb3193da695730df066153077c05d683cc822968afc1eb6b2ec8178. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/ATCW21711006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed45f732bfde87e9687070a2a4e290f52c3842ab9f8e19178a38798672596112. 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/ATCW21711008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eab7211d62e0c08e76781270bd291369af2dc504814bf50dc72f11aa5defe8. 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/ATCW21711009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45316108803a2d9d425c2770de86b03dcf5218295bf5ea844f90d8f6cda4a9bd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ATCW21810002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf07030151649ac0abb6972f6c4bbcd647331739b302e9386a1f226a1eb408f. 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/ATCW21810003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7befb696bceafe3880db3a5e1b9ac62f1257a287ba1e0005794954a365f708b9. 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/ATCW21810004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1828281de1ade7e56691c260d1901cf9e348069b20e4c50a1326e972cb5915a8. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/ATCW21810006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1cf6fd0b4838d4acc3f4654d14d79ab23f99c8c5fac83cacddb234176cc662. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ATCW21810007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5278368a67caa0a763ddb118fc1208c5e14d903158932dfaa90a9850ee9bc22c. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ATCW21810010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1883c5e540e81f7f31279b7e3ba59bdccf2a384865a98076483ba179c81cb5eb. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/ATCW21810013.