thumb|300px|A U.S. Douglas A-26C Invader painted in false Cuban Air Force livery depicting those used in the Bay of Pigs Invasion undertaken by the CIA-sponsored paramilitary group Brigade 2506 in Apr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a37bfc8d4c99e1a8eee4bdf07b93a65ed3438583f86a82965389028fb55436. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/721db7b4-0741-4b22-82d5-e385e7e09576.json and https://artists.proofprofile.net/proofs/artist/721db7b4-0741-4b22-82d5-e385e7e09576.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57244e0a185d279e204e2962beee882ffe1f0360c7bbdd30a17fbd16a68ef90. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:11:13Z), 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/QZRP52300892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96e0f2eff549f078c62d46bef717d3ee96bc88676c971ecdeae7914c7dd5996. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZES82521523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49760e33db9e1cb3046e9c6d286ec293bce21efcb1275249bfd6ca3064a26d8. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZES82521524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf578c14add08af9f722552eb29657cc058a217061032a97c01b9161f321eea3d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES82521525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3c3b30cb40c82b2ff11cc41eabd117d482770743a4b7431575c9b29959f762. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZES82521526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c35ef8d8ce0f60bd790bfffda0b6c804fb8debb88ffc90c7c426e4c32f683a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZES82521527.