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 0xd867103ddf09bc2b0cc75a72f3509622234e754046e98cf0bfdb052255b97ee8. 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/951c275c-0dd4-40e6-8499-754192f0d7cf.json and https://artists.proofprofile.net/proofs/artist/951c275c-0dd4-40e6-8499-754192f0d7cf.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 0x961b5350f7cf81985cacb87e9444f46d216ce58d3757c7ae495f41252b315e79. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/DGA0M2304205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8743c8c46fdaaae62dd8dc33da49fadfa4ec5d617c0cdac00cb2e3968ae5fb. 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/DGA0M2304207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cce5700ed32eccee65206132e46bf13d15400a37cd67f7d129e6af0b8b648c0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DGA0M2304204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a937174c387dcdfad6c45630a41083e4526d1d82c134560bf819d8e179fd39. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/DGA0M2304203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cce5700ed32eccee65206132e46bf13d15400a37cd67f7d129e6af0b8b648c0. 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/DGA0M2304204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961b5350f7cf81985cacb87e9444f46d216ce58d3757c7ae495f41252b315e79. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DGA0M2304205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8743c8c46fdaaae62dd8dc33da49fadfa4ec5d617c0cdac00cb2e3968ae5fb. 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/DGA0M2304207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273b302c432ac1095d723f9d225f6275a89ed723733da903fae686305ae3955c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0M2304208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3b6e1e1419053fda5e6f3c5dda9bffba4518540fb0960af54578d7f2f07f50. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DGA0M2304209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44f7876c91d56d91b61582380e7afd26dc0687f71b366fe37a2b1584eac899f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR2X42243745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739191003e7006466959db0b073230b70f3bc91ace5ccdec0a9b39bc51c97f20. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0M2304210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7c3855bace6238043d50b26fa716da71048cacdd99fe9c16d5e08e2b05c117. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DGA0M2304211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cd47ade68734101f0f6f022ead9b46e0049356d7478a3443019306fb0d8282. 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/DGA0M2304212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9f6d2fa5711b87d5ba24a794834e9790e9591c0a4d297d83b9c07cd53aa627. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0M2304213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c3bae9d06453b3fa0cbba4faba123ce5e1543a8bef3df40f5a32f6051e7ba0. 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/FR59R2274987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38751365dd6ef556f395ba5357bddbc17cf124102c1f11788eb9b6bf07b2aff7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRX872340763.