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 0x03d0c151aef2c5d04195c9432c8a6b69fe1c47525c9437db263b4ff6b5d576ff. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d968f9a5-a65a-4061-96d2-d91b4a9b38fd.json and https://artists.proofprofile.net/proofs/artist/d968f9a5-a65a-4061-96d2-d91b4a9b38fd.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 0xa4b04e73bc80475d23c61d8127b29d94ffbedfabada3deb63640a066a25f713d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FIMRR1700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d93b37579bfee6ed443eb4e9276152a359588c328a334de1d8e945de7c4f979. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/FIMRR1800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c445eda52264e8619db7633ad8159cf4e8073f706f09a1079bdc84e03e4013. 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/FIMRR1800260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5002eb7cf4cb741e2368bacd40c4c33fa4036605810e4357bd648c85bc4000. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/FIMRR1800261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91478097561a606510af5ecfcd57e483b8c5f26e671d469f0646b1b8e9c0d54. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FIMRR1800262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea5d3e28d5bfd8202dcbe9ddaaeaa0e1e43693013111fd124b363f00383b178. 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/FIMRR1700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf87e6add8b2f9a672af3b5de0d561cd93a0b49c801850f747f6e9f6e113e35b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FIMRR1700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc416063fd4f5198f5cf6837d294c44432ee713ba55b7f3ad34b63ab6688039b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FIS201900056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2910d4dcd44a6e53eacc004930e75c31716ce8b970ee84f70100e97c31ec024b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FIS201900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17de5029dcc52a0dc1f689ca95f64604fdf63b77181209fba7b9acfab0aa53f2. 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/FIS201900059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9071de0f69574a259ee2dec5267b8fc7057baf1c8d71aff94b3fcb53d5343d97. 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/FIS201900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0f8eeb28a9d0c84d246233b4f81ebcf8c9a5f4c6a1098054cb6e91893140c9. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FIS201900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6b1ac9cb1ac4dcce9e1e95a5d6c39e07276a0ea13d31287c618c66a076779e. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/FIS201900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699a584111e1825f2ff8c08fbc1d6cb8673bbc4d1e90b35434b00aa1cdef2fb3. 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/FIS201900020.