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 0x45166bce9587e81d881574971efe38a4fbf923a559fd10582281e31f3116490d. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e62d264-b515-4e27-a4ec-4c601cef0031.json and https://artists.proofprofile.net/proofs/artist/1e62d264-b515-4e27-a4ec-4c601cef0031.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Het grote Rintje voorleesboek door Sieb Posthuma
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 0x5771354fa7c8323e54d11fcf23a97175b1180f93d8b8d4ee341477e416e5b088. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/NLSB72100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef27fc337fae72cd95cb3d2344e39a0aee07952c7a2d13c6e38ea86176446796. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/NLSB72100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0d08efaefea96b7826fd685a6b7d69370025bc0a310a3dbd90f53ff24e0520. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/NLSB72100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dab5c986b8ea64643cbdf47724596d0f24d09621c1ee8300e40ebbdb39509f8. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/NLSB72100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c63444abdfaaf8be5bde50a44ed2318c129aa08b4370752fb6a53ee64dcfed. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLSB72100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4f5fda6bce32031fa0ab55b8d2deffacda60aeb570b7003450685f90df29a9. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/NLSB72100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff3adccf83c94f5bf20c8a69131211f0ddb72e2c084c6e032587edfd0bcfa40. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLSB72100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36062534e433f1831ec0b40df990ba8343bf0a97ac8fdfb54613b85c6200e88a. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/NLSB72100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c46382fe9175e67258a059507ac629a0d7e2541c10d06751afd0cced80f134. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/NLSB72100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb63c75056da232bcf6acb5b62da1bda3ac958e42313d3693acdb30e4eb094ff. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLSB72100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420f9e92a2c5286c1dda7404137b2f1f33c4667ab47b83e87dfab8e28930a7e6. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLSB72100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2478974363d925c776c3f72b797d9dbba99f4f719d99ef3f20353c112f6667. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NLSB72100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d999a77aa3ccbf8d41290a1c787e595d4ef56606f0d2930382a40466153033c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLSB72100030.