thumb|Icon depicting Emperor Constantine (center) and the Fathers of the First Council of Nicaea (325) as holding the Niceno-Constantinopolitan Creed of 381A creed, also known as a confession of faith
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 0x257f23a9de9c8480e8ba5266767aca50f5b00a50396ac3b20317bb4f4895218d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e229b718-fbb5-431c-a3f0-50dda4cc3bdb.json and https://artists.proofprofile.net/proofs/artist/e229b718-fbb5-431c-a3f0-50dda4cc3bdb.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 0x3cfd22def3fb45043deb5ab624f406fa4bd81c02ad1d1a4a7d6e21f6036a717c. 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/USWU30107505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c205e28a3e82c6770e6fd13eb3c358ea93847475c8f7b4d097699e2a407506. 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/USWU39908053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c205e28a3e82c6770e6fd13eb3c358ea93847475c8f7b4d097699e2a407506. 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/USWU39908053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfd22def3fb45043deb5ab624f406fa4bd81c02ad1d1a4a7d6e21f6036a717c. 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/USWU30107505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfd22def3fb45043deb5ab624f406fa4bd81c02ad1d1a4a7d6e21f6036a717c. 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/USWU30107505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c205e28a3e82c6770e6fd13eb3c358ea93847475c8f7b4d097699e2a407506. 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/USWU39908053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5933177b9e98fe5d64bf3122c14798280de1f01120ea47e12d0eea69982546a9. 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/USWU30107501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949725078fa0ab4b42f1cf80385491f3e9f54fa2f2594513b312aa5624c6ef59. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USWU39909053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949725078fa0ab4b42f1cf80385491f3e9f54fa2f2594513b312aa5624c6ef59. 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/USWU39909053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfd22def3fb45043deb5ab624f406fa4bd81c02ad1d1a4a7d6e21f6036a717c. 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/USWU30107505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b3af6aa58ec5000f8c95baf8f1e0cf732fb24caad27c53df9d7110f43ce239. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USWU39709049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cde14a8617d29edb8382d4397fc7e1471ebd89a545b6bbbb5ada97d4c92c96. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USWU30900233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b1c47b0e7847afb63ee031c66e1642ec72afcf7482d64a8e63d559415695b9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USWU39710049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5933177b9e98fe5d64bf3122c14798280de1f01120ea47e12d0eea69982546a9. 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/USWU30107501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a68ca0e565f872007d8bc1bcd4ed3386d47f4ebbf7f95e639c2f0b27e76aae9. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBSE31900271.
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