thumb|In 1995, FDA's assertion of authority to regulate tobacco drew heavy opposition from the tobacco industry, which erupted into lawsuits and slogans urging "Keep FDA Off the Farm." thumb|An old In
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 0xa852c53cc099739d1e0f32aa44ec0d9db7e504799c8f5ae0722eaf23304d366b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b723c33-9176-45f9-b478-7ed5db3a2585.json and https://artists.proofprofile.net/proofs/artist/5b723c33-9176-45f9-b478-7ed5db3a2585.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 0xd3f18a7b96c805f1427291810114232e5b4a7a89f001be925619057eb7501e91. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:00:16Z), 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/FR9W12207059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0b06ac3881351b28cd4a5f9ac0b07a80409d713bee8315d69ec764dab53776. 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/FR9W12320658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a089259c350a7e57066bf1278fa7a15a5cc4fc008fea7caf2a5afab547001d1. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/FR9W12351048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a089259c350a7e57066bf1278fa7a15a5cc4fc008fea7caf2a5afab547001d1. 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/FR9W12351048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9918246f0c34705f41d7497a2bbecc10a47bd6b010530fb14ee08c6191c9fcd1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:10:58Z), 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/FR9W12433437.