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 0x08503550068b15925271552a441df573a43c7beaa98aca6dbaa03874c80f1622. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b7c7a0e-f340-4b75-b438-bfbf31c6e8d6.json and https://artists.proofprofile.net/proofs/artist/0b7c7a0e-f340-4b75-b438-bfbf31c6e8d6.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 0xb5c444fc209212ab630caad477eb0dda34e799dd9c059c696f5ddcda0d2a10d6. 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/QZTAW2240840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119a00392bbd3ca6686c0f0e80ad1d0e511727883b381193d702c9878be3bb81. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZDA82367245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd2b0bfd964939a6e11803a794c58935ba69b390065a550914ef79866529667. 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/QZTAU2384190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d81d5bc221625ccf696850a1c91d7b3136af14ba2f7928b49e16343362743da. 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/QZFZ42477134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5e68616599d6434123e485b863dc70a54cb2da3e54ea4254c6dd1e689c291e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWS2444325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6735e8f7dbc1da8757c59b34a0a1481af6efbcc542201699a577654627f811dc. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFG2430220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61416eea921926920a84c71d2e597fe0b2a5f0c56178fb305ea19388b18314a0. 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/QZWFM2429729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca6c6688bf1e78d1867682787652d21e17e1cf19656224bf158b155439fc4d0. 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/QT3F42419753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437ce4ba4ea1205c661f63f510164744357de2fc547ff41a4148ae5be982cb51. 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/QZDA82579144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4bb6cfa0c95cf8e821260cc1b4189821812e9593b5a472da23d2320b9d153d. 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/QZHN52556757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6763da4a4e31b9baa2bdb78490b9a2c34ce62a723b2193d2818e974c51a4da94. 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/QZK6F2523319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7088494f7704e2d1723dc0791d64c2a3c2b06e055225511e460b88bd75bb4d. 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/QZMEQ2538774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5218203161ed1899ba064622f27836f0806cee81caea2f5a07c27ee9de3d5d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:27:04Z), 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/QZRP42592912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe550958a6c6a4ab6810051f8160393827de30c326a7a2299e498f92767ed4ecb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTBB2516656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fe7adc3bd22d9bd991d548c989ec0f05d09fda3d9269fb75749ea1732ffe18. 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/QZWFJ2548476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bee82a5b6dbec26c962313045e77db9e78be2bef631163302bf418c4652c6b9. 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/USACX2500746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7289dee974f8ce320b4933584abb119a5383be114dac644cf8102f6fe05311. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:03:17Z), 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/USACX2500829.