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 0x5044920076053b1c90ef504e38295893b6f9e336698f28c37a1f489d509532d4. 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/7eac3a5b-47d6-41b5-96dd-3c1f26c05746.json and https://artists.proofprofile.net/proofs/artist/7eac3a5b-47d6-41b5-96dd-3c1f26c05746.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 0xe3eff4459d7c98ae673e0f4e108c2da8a0393aa028adb0954417addc6f54de50. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR6V81991512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9eb50ba99e00a49bfb808d29301be4b7000147890da0c7d52090e3394b1ea4. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/IDA431603918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484278bc9672ba683f751e22d6c6d3cd38cb00778a371a999acdbed3bfc4a5a5. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/IDA431603919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e410b36f64af714c5398322d3c7d85e4209f3572fa67eee9fa3a7b225d29170. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/IDA431603921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1426e6bcf87547f4bb4837f85faf25123a4a91fcc3691fdbd2b4c5416a16e81a. 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/IDA431603922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84bcbb3259f6b1517f93cffb840dbb3810a46e33475d576ec5b7c9d0b59bf26. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/IDA431603924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4ecdca2eb6e8fd472e79a3db5a7cb70cccd6991b52ff580b4b6d31f5e31e27. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR96X1986883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dc5eba73e0c706dd0c404d449f60b871b0095da8ee0d86589b10325c19e7eb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/IDB292000466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dc5eba73e0c706dd0c404d449f60b871b0095da8ee0d86589b10325c19e7eb. 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/IDB292000466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0d14ed35c5ec8fe25a4b68519854e225da91a3c0f10a96c591af08f513c178. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/IDB292000749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb574e3972c8e3f0342733c91003b6423111e246a8673ac855e96bcab4a46c676. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/IDB292000849.