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 0xc9e499b5c017fc9736960de1056707fb029796b64fcf4a207d66f2fc191e5cca. 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/e5d229ca-d455-43f4-a873-080dde3d3c86.json and https://artists.proofprofile.net/proofs/artist/e5d229ca-d455-43f4-a873-080dde3d3c86.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 0x3fe82b9bf02f69bdcb306afaf524e606e5b1ef35226413272d8fb23007181da5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USHM80834347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7564788105d0a977768bcbb92713ec4c86eccfdf25ca380fb3338fc8d5617df. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USHM80834349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4351fe0fbf566c2ec902539e2470c54c18a991853639dc2c88678bfec767581. 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/USHM80834350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb522c0f4f0cce02ae3454977991142a6b05f8915c69eeb48648356a52049ec5a. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/US4B20600591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fbc91d4efd101e2548a01e873f26ead74f455b7ef5cf8f964d860b55f164be. 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/US4B20600593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a8988f1a0182b3b0729368d6847192992a7e6fc4bf3c2519575f0bf6473992. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US22K1100097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce00b2c3a450740de54aaf560942d1387dbbdda84a59556affecb94bd8a3a66f. 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/US22K1100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74dcb7eac554e1cb9669b6ea075ec1ade297cce922f96e7e955356e256f4b5e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US22K1100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8598d55b04b2dca2011587fae620b4fe4bd0525ecdb69063ff6d895aab9412b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US22K1515403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce6b38c95f4aed1b1f0a284153b744c68808ae17b91eff020c4589596f40fd5. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USY251778524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3641f01c134697b1ad6496370120864f942f9baf3f41940a6ae1f9ca5580af80. 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/USY252282677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fb9c284b7dfebcc677e748c57ee768b5db7544ded2c8f3534fb447eaf72f54. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USY252282678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a94dd4925665dbeeabfa882ae9af1a57d7293707da33036e86f4949b7a2fd0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY252282679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808b7d92e913dee8725de2a851701a8d13e113f1477b127d0d19b5d55d73a652. 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/USY252282680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4929663bbf969684cad4ad2a82a3fcd67140cdc7e5cfdde75ec0d130abc2489f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DES562310838.