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 0x9f7b56cf93477546dcca368d768a0f8214e9fefc83ab251ceedce5fe9dac542d. 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/10ec9ca0-7314-4b40-8ad1-ea0202702f5a.json and https://artists.proofprofile.net/proofs/artist/10ec9ca0-7314-4b40-8ad1-ea0202702f5a.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 0x978c19d00828df3549b17cceda27bef947960d1f03e143d0e26af3186a57449b. 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/NLCK42235632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb8bbe0e630982580f42b17f37cf8d0a099d0b1c25a1bd28e7769f0c5e4684c. 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/NLCK42235633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e040e8db2d7c8489949f719fee8e8c08d35129f80343db3e82a17e84da0010. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T16:54:40Z), 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/NLCK42235635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbc4763bac748e6edf07fe864a514ed0aa83499e4ec4fcfe428821a97d65dc2. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:05:47Z), 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/NLCK42235636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b99798bf421c19fe969c3596e05d1f1d1897eed39bfbd54590ca48f405083c. 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/NLCK42228697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd57de7371af5f9bffbfebc537066f9f55e02ef4abd70bf0f7639af57610c7e5. 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/NLCK42228698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39faf1f60846c5498b42a67255717c9e250412a591aba1e70c3aad1e269d92c. 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/NLCK42219574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf497392ffde3e260becfa09e62cd76311cb70fe930642abbcdf062ee37963bf7. 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/NLCK42215676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b778090d4868d64f6ee1729fe07c662427b9961effa47defec450881f23101. 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/NLCK41096916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55097ada6a2ba3948d91053a67e739eb912e521bca048b58b41f3d40a6921e0. 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/CA5KR0038693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b778090d4868d64f6ee1729fe07c662427b9961effa47defec450881f23101. 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/NLCK41096916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81e8fe786d2a97a8dc80eefa8175f4cc75e84a69033af1326a5e595883acf90. 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/NLCK41079345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae9e4572a2b35403c39f2cc85fe7b7396a9c561b5b16334514b789bc392a2cf. 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/NLCK41078225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03183c38fd5a63429ef7c1f95143b15e4aaef6958cda96ccae83c4e029c5ba4. 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/NLCK42405927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b9b6bf3ab6e92af7cebe3967192d21a97cf131f9951609dc53e21c280b5125. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLCK42405929.