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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27deed16a5cc2e01c63fcb1af748b6dad2457c383d593da1a6534f0dbeae6880. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cb5054b-b2d8-4d76-b205-0cecdd32f097.json and https://artists.proofprofile.net/proofs/artist/1cb5054b-b2d8-4d76-b205-0cecdd32f097.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9d877513ac4c62ff471f3a5d88dc7d222e02bfa7d7512c17887ece2fba91d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/BXTAC2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf93a64adcd238040a8b42d5288f167f35a1f1956ad57bd028fabcbeb4d353dd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BRRC70900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1ae8d904573e493af64e5c5853475ded898e942037f8f7c13687464ec0fba1. 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/BRRC70900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88f7463a5392efdc47766808fc77e5bf3159dea75e5a780a23ece25d24149c2. 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/BRRC70900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57772166eac4e8713744f2644d99835c4c8763533e587c16ba91a1706d40c3fc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BRRC70900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e02378c6e0e119993adab646e7052391b775401c30e203b0f3a6f33a56f785d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QMFMG1559372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7463ebca3a4a8dd99f7575f7ccebefecf4367f6d67a64cbbdcb3eed6de7a3ef3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRRC70900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81776c3a55dab2fcfb2b17032eafcba377d127c6c3f3c9c5981c12e7d23f6114. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRRC70900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd0a4cdc7959ff8cd0325875a06910810389767a24cb5f250feba69dfb53895. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRRC70900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc21831dad1ae08cc8715a16bf40c5f09accf876a2e2fed94301a726f5195f88. 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/BRRC70900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69bfcf8b6e44c80a1fd5359adb20aafe2ff7591cf69f8d6b3adee4b6bcb15629. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRRC70900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0894fda0d5ebc14358e766130c32e5bdff2843d48779cbb01db6638e9a1c85. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRRC70900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacae016ae2dc7258787e62f2d45c6ea81bb2addcebfe03af87e33d8f70a65457. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:15:54Z), 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/BE6F59900860.
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