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 0x54b32bc252742f3326ef7a604384381b440627e838d64678e4afdb011ec2a65d. 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/566160a7-6d6a-4c59-a19f-b0300f2674dc.json and https://artists.proofprofile.net/proofs/artist/566160a7-6d6a-4c59-a19f-b0300f2674dc.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 0x2a01d3a98543788a1ef6fe0a4e979d175f9ba4a24e8545d2c1616c152f1d7ad2. 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/TCAIW2433696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e012aef275ad10d96c43591e3790f5e659404eea01987a17323883f1eb8a4ad. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIW2433878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4ff889cea8a654cad02c02a3ebd6335b5c36ae20a4f88440c4253ac1e68253. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAIW2433973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3580a346e2cfada3f8b9b19ca50073c6a080fcd691aa25d51989aefcc8b4b3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIW2434115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a796f61bdaeaeb6cb85fad45cb898630ac75af2ff258568fa158f060e7a557. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAJC2401164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e2e506bf28bf768b7bd6a04fcef24f08cef21c3628e94fc625051d561a0004. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAJD2411721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf707216b07b7271de87b22f29663f815b9f68af62c1578ac201d78e9638df7c6. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/TCAJC2411931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1103c7fc9e8ffdee22401d3bf121714ce0cb95b4fa068139009be383c406898. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCAJC2412071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6885533977afeca8196e7fabcc85ac171325c4e74c71b128e150fa4aced61b31. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/TCAJC2412568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34aef0ea8cc1b41fd8c37be90179bef762efe80e11fcee5c50b9d801d4621d6d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAJC2412686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c839c3de1ea48f9323a7ff6f603c8acfbd76fd1be64ece89df346be85306a89. 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/TCAHR2301791.