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 0x154e4e2ddf67d3f357e57f781bacc552da521754d8bdc27cda93695e93cf6a30. 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/42cc42b5-00b3-4e03-a289-b6a9ec32cc68.json and https://artists.proofprofile.net/proofs/artist/42cc42b5-00b3-4e03-a289-b6a9ec32cc68.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 0x15262104bf78493b78eefbfb628fdc11dddd08fd88f49184b4d725cbd9febc2e. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:19:36Z), 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/QZES61908365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f21bbde0369c41526468c6b061a1f20a462a3522296dfd51fbe3971ce2841f0. 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/QZES61908367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f1b2005a94822458f2af1fc2d6906ab2c7ed7c605f07539a50bedbbdf5382e. 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/QZES61908368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55589fceec8b8179eb4b99b6bb9932e9afae4cfbea6627257ee674b2945c76f7. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES61908369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4dfbe12f5a5468f67ca9a99df88e80e3f3398ad98c617c5c9cc7f87d8fe3e2. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZFZ31914593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7badc2b34ea4daedceca6e7d9a83a5a9eb039fd2361570327d29a3ec6d2aac43. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWW2350855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76898a2b4b69066bdc0c61904d9a4808510e438135878cf659d3a60b10ad2be8. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:35:23Z), 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/QZK6P1920783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1ee5d2bf53e35a4bec8803dcea77b1f0fc4e513da94c8dfc710140e209f19d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZDA72039460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8299a06fd5b3dfb1543eb5524538fd20fa62c762c8e7f46fb42f8aaea288e0d0. 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/UK3AZ1614596.