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 0x0df9d239ff763307aefd302bcf9399ffb000c500336ac593b9d24a087395cd50. 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/2ce3b532-001c-459a-aa47-97e028c981c3.json and https://artists.proofprofile.net/proofs/artist/2ce3b532-001c-459a-aa47-97e028c981c3.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 0x6a92c1d4b0096219509e08f4c81f6be3b7c0f8fdcd181e270345e499e4916c66. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BX7592000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11e3bca796cc391997fe1d431ee8f137eaa65d7c3237f2a5dac3b873c3ce5da. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:03:02Z), 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/BX7592000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11e3bca796cc391997fe1d431ee8f137eaa65d7c3237f2a5dac3b873c3ce5da. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BX7592000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3480c15d8a7e45c29b087d706702a1625f469ef081c2b54c128352109ca495bd. 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/BX7592000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecf03eb95f86cc2600b30373403db239419eb15bdfc3feb55cace77b2cdefb7. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:31:54Z), 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/BXPJQ2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f640625c76ab7b2922096cf4f4492f590cd60024735bd7278aa315f2f844a7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:14:51Z), 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/BKPFB2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ef21d8d1964ac9f2ff6f9707b7b2bfebbd2f0327e509e048f8ed28d58e0124. 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/BXJ3W2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a408919c073f20ed6d1aeb56a0b39c026ee6334fc44fac2f010662516219233. 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/BX3PN2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa22ce80241ca67117d2d316a4ea78925531c3e6165fe975b0df941eba6e7e31. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:45:21Z), 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/QZNJV2088465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0af0534d0c08292d5171565cd3f5e4fcdab63b2361fb0d724803302d27eff8. 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/BX6Y62400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f6ab661962e644a741cf002edfb9ae7146c64f33004c55fe19be73903747b5. 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/QZHZ32143230.