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 0x94a4963371d6368f99642cc292ed7c5d3f55e48b1fdd9197dcaac3779c159af3. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e645be2f-0674-48b0-a286-d28b05be5a14.json and https://artists.proofprofile.net/proofs/artist/e645be2f-0674-48b0-a286-d28b05be5a14.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 0x1a95a73a66745feb2ba1676cc8b3083803581793ad8d8deaff93653c92a4ee99. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZK6J2418767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ff8f9fd797cd372a9ee0c90688ca27b97a39172fddf74204fc524da194ea0b. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZK6J2413102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe088cb787fb11c7da41eea6311fae14a27e694d0c1bfd371b67f1ec72b4a36e. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZK6J2434669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2b2c7e23352046cf00f6afda2a8c5108413e10c4125698dc3b28302659b976. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZK6J2433318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615dbba0138c61a239fc4dc7c0ebc00b8809a001f62cf6b4b4ab655f400cbc5d. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZK6J2487541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67806511b13949d5d64a4f1c9514a5c6631114a03b6575f945caf4d929f17b6e. 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/QZK6F2414751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653e87973708a7757b30b8e362751f243d85c9d6b5710b7f0a95fafba829ae0b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZMEN2475247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71ffe82ba5e8a9ca6773dab3691682b99ddebf4035ea161b6d028adaef908e2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZRP42482656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c917c6ea05ad4663f98d44c9f12b7a01f7ed87db2bd25c497596ade19b991d2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB42449576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7278468290e655de5b5e86d801cdb67c7fdf46e96fd5da0e2d78ee2695d2507. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTB92477526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f1980d2fdbe9e868f7558b91534f004aed5b7baeba8701c2dea07e206f54cb. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZWFH2445838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4b9249b87ea34ce6fed7e893a89cbd806300af0728542d42029cfdf968c0db. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ792432449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5295c67efd773fd1e38115aa23d20afbe0bf3f73801dee48a8c98bacc4aa53be. 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/QZMEN2591219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecb75284a7f4fe7a85d453b40fa844b0c27f74c6e7b8e3cf11ad6f5689b5cc8. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTAS2572661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5af0dec833d3bd2800c7c65c68df207d3c73e3b2c71702ab83a1fdc92c5b693. 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/QZZ7P2537272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded83ca0b6b011f4a349c542bce34f3fb574cadd19cbae413d5207de6aa64ef4. 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/QZZ7S2586474.