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 0x5c45ed1cfdc841469fba7a1e2ab5be66052ffbc8d44196b1be049aa2afe6a668. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e961eec4-3aa5-4563-8c52-7e05268dd134.json and https://artists.proofprofile.net/proofs/artist/e961eec4-3aa5-4563-8c52-7e05268dd134.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 0x196a24de62fe4532011b5fe1d5cce9198451757d75194c6040fe9848b6f664db. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLE031000296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b504333ec4b59f14fc1484ccaa93b4fae3c6e464abab02200f2c047ba92456. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLE031000297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d1867445761abbb523e5296d41520a8d46b44526f71cbadc75392d6e97a9b9. 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/NLE031000298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f71ddf279025504a242f7bce835ba0e680cbbca60628eaff6b58f029b738e2d. 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/NLE031000299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac78369a3ccfbaa2cd7bfc39498ad2e53241f5ca6b200718303aa403f3ecf5bf. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NLE031000300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd84dc86ebb66e504a5db0ff01ae83ce82b1412e4417da7714b599e03aa7308. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/NLE031000301.
In Zuid-Laren Zijn De Scharen Altijd Goed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e89d1976772c6c5329d1e1759d092560e5f4593a1b7ab50b5da3bcae93ce992. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLE031000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13b2a27930825c7a36ad0ee9d0c3ebd8b4ba4dc3b69cec37a2329a6ceb890d4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLE031000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30aca3f42dc98307113907b28b0bce68a954ba6f2d42f55bc2ba20cbecb38920. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/NLE031000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630dcdfe5db3cd3cb76ecad066879b759db7b918485da3eb403e22a16e38848f. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/NLE031000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38020102023d8f835eaee68bfea471f9f7bb0dadeb58f77e0d8151e0f70310c5. 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/NLE031000311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2522962d485e8c162fbc96eb9a79ed5781bb4c04a31f61ddc6d0816f818fda9e. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NLE031000313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e21412c3d6d5b173d85f57d406e9dc0104ac1e73798b733ebee6ca73702e25. 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/NLE031000316.