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 0x2d5bf58e703645023a65d1b4ded1b31d59d136f32641c7a68b14ca6336347d14. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1ecd15e-e841-4bdb-bb30-461354e88613.json and https://artists.proofprofile.net/proofs/artist/d1ecd15e-e841-4bdb-bb30-461354e88613.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 0x8d0e32e61f8a03e1da829869250a77c0a8304ff2bc9b984aad82ae1894810651. 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/QZDA42532811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3ce8ba7a49ef9eedfc7f323659b245fb2ca65608f3795d329a4becdd73cb32. 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/QZDA42532812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa672a12c47d97735e907bef1ce863fb3af547a6910bae4c79352108930e2eefe. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6M2530007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b6a585e4426b9203c5c9c5a6b5cf80d521aa83805bef2efce537a0d816dce4. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6M2530008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b6a585e4426b9203c5c9c5a6b5cf80d521aa83805bef2efce537a0d816dce4. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/QZK6M2530008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae285d646bc5a633325576e6afa316572d7d17daa00f94a45b1ef4a69a321fab. 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/QZMEN2426334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e00c4db9c5f4c2b6bce4abd45677b278d7190e8430b2a9035d8f4d9e8f667b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZK6M2530009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ca3e5a2a011f49861a54b2f3cd456b577b20f17638a5462042e6f9639a27b8. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZZ792412040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3ce8ba7a49ef9eedfc7f323659b245fb2ca65608f3795d329a4becdd73cb32. 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/QZDA42532812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc33f545f44327860770d213dcb82bad11cf6978830695c160cd45892161d641. 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/QZDA42532813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa672a12c47d97735e907bef1ce863fb3af547a6910bae4c79352108930e2eefe. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6M2530007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b6a585e4426b9203c5c9c5a6b5cf80d521aa83805bef2efce537a0d816dce4. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6M2530008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a979b907887866694c7f0a3476bcea1ecd54c85331feb17188c72fb4d62f95. 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/QZTBF2467999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0e32e61f8a03e1da829869250a77c0a8304ff2bc9b984aad82ae1894810651. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA42532811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af6f11f82228656aecae44910596d7da5ac7e7bb8ca3a0ae11d26bbfe246b0b. 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/QZZ8A2511042.