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 0xf45e9b485aeedde4388cebb282e0cc0ad50192a0485a88523d8e03130b046014. 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/3027c620-48a3-4f3d-9ade-7b0be9b2b811.json and https://artists.proofprofile.net/proofs/artist/3027c620-48a3-4f3d-9ade-7b0be9b2b811.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 0xfc28015f402369af48c3e30c2ee8d8ba4b94046140a45e5282ebdf27ddf403ad. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/SE5Q52004169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5addf3bf30c6d070d9e834066872e75697520db87f78e42ef9ed77b3c8589f5e. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/SE5Q52004242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff3cf81d538cd11adbd8251440837a656c0bfb31205d8919368b266cec98cf4. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SE5Q52102943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd8b9184475c3a2f57b59f9479e28352590670d779dc3290f36effeea68b780. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SE5Q52200453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff852fbdf457b99bcdd466916f8cab40e104123991c022c000e7ab141f8febf. 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/SE5Q52104593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5dab7cb623abc4475fbaf5e586099dacb5ea8229e6609b07205130edfd5dfd. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/SE5Q52200372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa481641169c01a39125dfbd0b752b775c0b042f28abf111874d488e76335cb60. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/SE5Q52104491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1494959283da46e21c0d70db757c3241df1bbc669846d45478466552e9b23746. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/SE5Q52201089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e456cb235e8421aedd93ba18be342ed6355fc8884a2eced3fef052c51fa5c42. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SE5Q52202527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdc3d955f760b63701c6655127674a9ba49138261ee7e61d01e172e0d8033b7. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/SE5Q52203747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f995cb53b36ad562e06c87f5e4cdebb0f7add54ab4c393c58ed429f3d9d0c63. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/SE5Q52203790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295579562d1f51afb8b61817ad12ec19f63e4cbf3115fa0266d772d7f43f743a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SE5Q52204213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf6c2edf2e1ef14264e15f07401ab4797b611f988ea4c3ee5102f56439b03c6. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/SE5Q52305057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816207da21c479ed35d50678cf183fe8c8dc21cd74c56f3c2c965e0477950b62. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/SE5Q52401737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b030ac7fd5e891bf93a62f016105e87ad435156c7fc96904bd4d3d2e5545d7b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/SE5Q52402892.