thumb|Austrian gold ducat depicting Kaiser Franz-Josef, The ducat ( ) coin was used as a trade coin in Europe from the later Middle Ages to the 19th century. Its most familiar version, the gold ducat
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 0xe0a2c1fc771cb81c9e32869612937c07e65768dfb6b3db289bddd43508037d94. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d742155b-718c-4803-a2af-5f5d93ae9e82.json and https://artists.proofprofile.net/proofs/artist/d742155b-718c-4803-a2af-5f5d93ae9e82.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 0xe668be49e06266df066112227eccd58af37c863f73f2565b9b87a68527432149. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:44:42Z), 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/QZFYZ1934637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5fcd9e1fa4134aa0a73bf9d853d03c2abb3a917395d10d734cbc72447e9f52. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:32:41Z), 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/QZHN42148241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9a239824935aa8eeb1a94ba6b3c16af13d43a06a15f26497975a728d219005. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZFZ72023120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273bd03ec04bbf53d8bd4e2f7cb3139790ebe63239a792062f78002915bb0f15. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:08:43Z), 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/QZES72286146.