230px|thumbnail|The words "Best Friends Forever" written on the Golden Gate Bridge. "Best friends forever" is a phrase that describes a close friendship. It is often written as the initialism BFF. D
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 0x52da41d8d6d2cd50bb6ea1d8f18b89989dd273c569e4ec0fa2e3c0f5bcbd6ff2. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de847d49-0a68-45d7-ba9a-f4965cf505b6.json and https://artists.proofprofile.net/proofs/artist/de847d49-0a68-45d7-ba9a-f4965cf505b6.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 0x179d192ca5e8c61b8c5f7c6e5473b09f6724b4c5aab0c62e9bc434c71f5466c4. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:07:08Z), 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/QZAPG1880001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3835258208a3fe9eea0367e3de5c05e279c2fae0cd3a2a7f616d400355bb8d2. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZAPG1880002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ef90047568c11ee420425c0bcc4e36cbd1672299cedf71dc1a71c63455eae0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZAPG1880005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc791c6d40720e2df326a54ba530959733f7de2b263afc1619daf2f8197fb5644. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:01:10Z), 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/QZAPG1880008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb246c9e6e47b970ac3d62ae070c45f819bf5f73f10886b264b6bb85286d8d680. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US8250810060.