150px|right|thumb|A ditch in the Netherlands thumb|right|150px|Ditches at the Ouse Washes nature reserve. thumb|150px|Waterplants growing in a ditch in the Netherlands, showing Sagittaria sagittifolia
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 0x1726973c43029f628c3b74d3b5cd8177f0174927de0c6233c6115a3b196818db. 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/ba40d91c-d13d-4dd5-9e60-a15999053fc2.json and https://artists.proofprofile.net/proofs/artist/ba40d91c-d13d-4dd5-9e60-a15999053fc2.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 0xfc062f077859f429b5e6268ac657b440920aad1d93da7c6121d37064139892ce. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/CH6540855939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bed6175180d128b5560efe0212252dadbb50db2ca97a5a64109ff91aedecff7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NL5DS2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710f031a468790bdced80b9e801e316628bcbd00dff5a40129624f9e31c5543e. 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/NL5DS2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f03a037b5654d8bcb8887a32841b3f4be26c2fc62a0e460151dab8ac4d946fe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NL5DS2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5eb6f2a2fdb07870a148dd70949732f82fad4215ce31f499939121f2097b63. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NL5DS2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e94ee82c137fa1ad5155140deaa3c36a9e82e753c6f96f94031d4fcdbd9792. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NL5DS2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986f38121b3c357e6ce9234bbf666ce5a14f14959a6cfad3a323aa6053aa67f9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NL5DS2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8a43e21846e4202f48af9d3af49378b3185efd704c4f13ac060789bd9e6f89. 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/NL5DS2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dfc3cff30af61aaf8afe2277cdb43a3a0bc9c2111bf27992e8e427ca929ad6. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/NL5DS2500008.