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 0x1db8d6ccd4fb3f5b8d0f9550a5884657b514ee18baf042daed9a9ea7e3b38aa0. 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/049fad78-40a0-4e04-b10d-83584a7217d3.json and https://artists.proofprofile.net/proofs/artist/049fad78-40a0-4e04-b10d-83584a7217d3.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 0x72160c392fe40920788e40502a94512c2374f060f167417f0e9532d02e9dd02d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GX3Q92116726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3439712b9f1dc8921c16d151e2dba5e90da49d53c4ffd0931e41485d3e226d4b. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GX53U2079771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfce2c0267a21e4cb97af75f98cdad1e2b35153b415df45d23d60f5bc568d2d6. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GBLFP2207089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0ee2771241d1e62495afb1e9a39b091ba1de755c5646bd9670418c6b603738. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6MZ2392416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e75a227860f2378f3ef0a505bde8da531786fce9762a52bb6659c4c649b49b7. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QMDA72312520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc720f9edcde4e626abd598bb94274c5e40c8029f87a955904f0b8c91b40d025. 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/QMFMF2330199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12afe10c028376b0724a88ba444a1e6f9517d7cb4add93ede2fb9e25cbc617ba. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM4TX2430523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67becc6bbfa22c4a5254696d6113e32fa314a3215d1035daf8a3c001344a380. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6P42413817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fd85347ac03b30fad9fc7ef579771adb63c1edf65d99fb57f8a7a3fba44943. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QMBZ92400384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0ee2771241d1e62495afb1e9a39b091ba1de755c5646bd9670418c6b603738. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QM6MZ2392416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ad9de00ef5b2358d7843bcebd0f4008c8803b59407955b821318481cbfbcce. 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/QMDA62415121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fd85347ac03b30fad9fc7ef579771adb63c1edf65d99fb57f8a7a3fba44943. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMBZ92400384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e75a227860f2378f3ef0a505bde8da531786fce9762a52bb6659c4c649b49b7. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QMDA72312520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67becc6bbfa22c4a5254696d6113e32fa314a3215d1035daf8a3c001344a380. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6P42413817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097fd7384020574cdde76827628e6f0347cc27fe98d64182988a5a41aa2e7f14. 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/TCAFQ2166649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf83deb74266e329338e4f95bb40f933e6c8c96351a1c0f8bc27e1a7caac0cdb. 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/QZK6J2056093.