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 0xbecbaa65143144558f3ea0bddd54328600271d633d8cc9126ec79828befc3c4a. 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/b5aac5a8-50f0-4f20-9d8d-fb51feb8aaf9.json and https://artists.proofprofile.net/proofs/artist/b5aac5a8-50f0-4f20-9d8d-fb51feb8aaf9.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 0xf38b134e80ca2028bac668dedcbb86714858fe43275ccf517e7aa58ad7f4a623. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:44:46Z), 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/FRIDO2113225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd9e13643bd477e0d427b01cc9b1e7a3900c911d2cc1f3f3145ffe3ed032e67. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:09:30Z), 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/DEQ022381853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86d22f1960931aecfe70c46060848c1d79417a6a0b1bb1f65d79368b88cddbb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKZGC2304511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1e37ec93d5ae429cb21f64c3fa9f325a4d38d94bbd579a627347595192bc7d. 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/NL1LE2302959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b103dbc1f124fd8b0e46aedfc17e0fc460cd4a04982b877831a911a10e9d57c. 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/DEQ022383592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2b6a40a60ee2c98440603e98241472ca6c3be7b4eb681bdf6316ae2742a1a5. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/FRX282477342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5c690a54a4dcc4c9b962d883df60a2445036e53b827a2964bc81d2588143a9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLSB72400452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f435ab69daa70044e7ea0e45c1a2249f824551b9d83bd938c4ca0d511c8a021. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/FR9Z62500210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dc05ecbcf83c65a2bf368977fabb8648815b1b68db2ebbc0c9f604793145f6. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:08:30Z), 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/FRIDO2513107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c99d0d8c9109b6463970f45a04d51a08fd11c12f71d69cd63b36192913fe7be. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T05:36:21Z), 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/FRIDO2598813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dac66336942000e4559ddfdd10dc5d23cdd2f44084b5b4ffd6426991be47f1. 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/FRIDO2513108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7793cc1ac700616037a0cecb45c56193385afc1fff6e600acf6546b80e42a5. 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/FRIDO2513109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b982c40a0974191881bf46b6629892badf8b017f78e5ccb5d94184f19ac1ffd. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/FRIDO2513110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1e37ec93d5ae429cb21f64c3fa9f325a4d38d94bbd579a627347595192bc7d. 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/NL1LE2302959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc00709820cc93100f68d4ca687d28e7cda48f242907cf1d49e221b24694585. 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/QM3DF2274262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681b790089b1e7671781d6651ab6f462dcaecccaeb5c900bc2f43fb00c487750. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DGA092439168.