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 0x1a47430a8970cdc6b53288e16cf6b8b54f59bae9aa77a21620f6f808d48f6cc3. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c96e85bf-62d4-4be6-8539-70e865aca790.json and https://artists.proofprofile.net/proofs/artist/c96e85bf-62d4-4be6-8539-70e865aca790.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 0xd51be985e9563834362005eb978d5cf15c6365b8eebed133c34d6f6f21add01e. 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/FRX201958004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd67e5ae74668b003b4593f4b9a7f281da4007557d0101660040738b819cbe25. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKJ952008555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05954bef7dcb0b0ffb1e0cc79639ee96d7fc4160b36d3231598f707a65fad913. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKJ952008556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2545fe97676bf9e83645a867fcbc810e719f2790359c7bafa2c635b78e437364. 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/HKJ952008557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87308bd20cd4928c242a1c6569986c88526ab01cf92f53c41a16d68ec7af864f. 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/HKJ952008558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3add49f2b030a6d281c10d6a435b6a1506ec8a0364c824c6e654a778c2fe30ba. 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/HKJ952008554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bde5e4529870bf5d941c2f5a30adc1d2ccb4bcbbc6c5a2b7d14f5d266ca814. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKJ952008550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d57b84d6844ed9b6b7ae67fcd14b73a976142dc72b43dcfd5521e63f6f23bf. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/HKJ952008551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe281423dafaab40fa1814a27d4720b09e61e6ee5641bfaa5bab2683705a72d0. 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/HKJ952008552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab5425a43840c3f0075333ba55028fdf944b8d7678efbc2636b48bbed0f40b1. 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/HKJ952008553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c40eeb02383543659d3d2c4e43a0520cd5031399d69c5a4280573125d50b2a5. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/HKJ952008562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbce537366b77beb2c3dc192555c43a941f113b4334a0c5b4f9274b3a9675e1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HKJ952008563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc152adc3cfab969de21eb71356f3b60f34f8875bbe4a1ae926546cf96c4ec652. 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/HKJ952008585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66887f74e9718fe91d42ec1f51323abaf087d46f076052240f4ab34a10dbbfd0. 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/HKJ952008586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdedee5f6c7faab804058d95be14c2b94cd4602d70d4eb07646257614dd7435. 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/HKJ952008587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128b2337f76ece2307b669cff1e6fee5608e85c3219822df167089cfa8d2011a. 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/HKJ952008588.