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 0x2e23074920fca059ea32fbf06aaba87461334fee70384690dd16dbb44e12b222. Chain 2 (Bitcoin): anchored in block 953794 (2026-06-15T13:43:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0fb5cff-1f36-4458-acd8-b8455b3db245.json and https://artists.proofprofile.net/proofs/artist/e0fb5cff-1f36-4458-acd8-b8455b3db245.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 0x84f984cdcfff43e072ff31d7aef1c9b924e5f971fe3c18cc8eee8e904e6e034c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZDA52550674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfe16f7195982dd254ace163ce8142828850b30541f555420f2b29f15d6be67. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZDA52550675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1053bdc06b35cf369e2899a17f44b35dda9db2767dff3d2f2886cd8840c8777e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZDA52550676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690988cbaaf870ff901a46ab490ab7971de5a4e50e4bf9252c8a59ac1fd6c260. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZDA52550677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c6aa27ca760b8ecc1e9b5165850ed125e80ad4903c3bb3081b8cd3129e1e01. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZNWR2589216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf610f1871152d7a6dd01008203e9eec13e4ee02d9417971d65a134442b27307. 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/QZNWR2589217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadd37d5be43c6e410e15c7097a2bfd30b48ec52348d30d65722543bec5a6254. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWR2589218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e18131ba2e681e74a534b0a2f69b0e593c29f587bd318a8399bbad88230cb7. 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/QZNWR2589219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6575b64d4ec02f9f72681bb1cc1259178741bc223f3d950fab82e44cf7647a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWR2589220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278a53c22269ba5f9f00bb063f27f48631daf2f850bfd5fea2c2c5a11e963071. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNWR2589221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9600d59c7757e899741ec4694c94afea02de6f364993295f7e1b49316b9de4f7. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZNWR2589222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3603b0473f18a8a70cbf2e2f4391e315e6bda08acfc648c0674830010681be4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWR2589223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c6bf5e63f092505acb8f7e60bb28ee7f364e90d5b05ea7bec46381a9274d23. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWR2589224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16bb9614567df47f6d51884abb473178008234a7102d696ec98e265faca91e6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZNWR2589225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652b4aa914c144fd26f1aed49f29c0d2b7bfea0e23a44da85d571c3538cef283. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZNWR2589226.