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 0x388de5e2d897cc2a4f5084d30915775b6837bc34f87272555bb7df975de423f5. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e94ee38-0903-439e-82d7-6de1680afcf9.json and https://artists.proofprofile.net/proofs/artist/6e94ee38-0903-439e-82d7-6de1680afcf9.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 0x4ad0c367cca6ef8c864e45eb1ca8232ea6413abaccb66fd3ef9524d3fd13a527. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBKPL0924719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21006e02353bec18db0774727ffc1d5fa09dcd0dcc00d14bdfc9d3a648043e87. 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/GBKPL0924798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136441055b6cae96e0ebf4b42eea9beda5f8bb6518a8428b5e21a905d811ddcd. 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/GBKPL0924817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a774475f29ba64135cc804d02c5052e3f00beeed7bdfc80af2d0dcefc280a5. 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/GBKPL0924818.
Vrolijke Christelijke Kinderliedjes, Vol. 4: Kerst = Feest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4244728a7a9633e5af26163a3cca86c00623bada525c3cdc4952428100db86ef. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLL152203559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd092d2ec969e76c93fa03fe61c0a824d3e1e1db8a27095bdeffd357a4a726bb0. 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/GBKPL0924845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd40d305d06f094952e69c49bf989e1f8e5705c7bb6b5b563ec31ba8c01bcebe. 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/GBKPL0924782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83eb89c3aa62a3997256286810b07d11d29c9868f4c3a99b62cee424894914a. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/GBKPL0924737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d84fef8cbf2456a7d1b9e34ce26a4f1a746de9ab386b15da0fea35bcf99ce3. 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/GBKPL0924743.
Vrolijke Christelijke Kinderliedjes, Vol. 2: Beloofd = Beloofd
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbcbda002805191b130d83dbe39d95ddce5e69d56ebc4f42eecc6b65e37457d. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLL152203416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860c65edcff1a2a5be0a700280fdd5e518b0cda285f4b7d1fd5214af804f3a8c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBKPL0924698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97df18b9b47e2226155ece56cdf051e5b772c71da4b75e98bab0098f2bf092d9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBKPL0924705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5c90fcf78e7ff4d0c09ea06ba1bb08b63292d758f53b42cd9c2c0aa6fe24ee. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBKPL0924762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e832b6677900a647ee02233f72303563366d801cf05548da129820d404249f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKPL0924767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b67463be47c044fae99f62e27d8bf70a5ce2ca0dcf41c4f0d67a3d1c077fa8. 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/GBKPL0924774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ae1f59e61f3208b22b822ec83a165f7e25afd10b71b36562210e4f03d9aafd. 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/GBKPL0924775.
Kijk es! (16 nieuwe liedjes voor kinderen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b269d8f07bee3b93ad6c07001fb6d0dda9d052536795b1b117b3af53e7f337. 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/GBKPL1031328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bed72393743195e3728aed8175f3f83dc0d2ed784fd8996090af5627a674e5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKPL1031337.