thumb|Label of a Sam Lanin recording on Banner Records. Samuel Charles Lanin (September 4, 1891 – May 5, 1977) was an American jazz bandleader. Lanin's brothers, Howard and Lester, were also bandlead
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 0x44fe969838109edd3265e3c3b1a99c4f767d1e963eef88d0fb8021bc86810602. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ac7eee0-879c-4b47-9074-921ac9ebef66.json and https://artists.proofprofile.net/proofs/artist/3ac7eee0-879c-4b47-9074-921ac9ebef66.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Big Broadcast, Vol. 10: Jazz and Popular Music of the 1920s and 1930s
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 0xb4c38807bdd290f8e39d2d72ed345b12cd889427242350c36c15e5c5e62b8754. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM4TW1514096.
Sweet Georgia Brown (American Bands of the Twenties)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7aaa451e4d59fd027e7ea55960ceebbef0a9ca124f9da6d86d14220a8ca6567. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEBL60616309.
Hit Of The Week - The Cardboard Record Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cd846376936e68663b44fc31ce52bf73b1112a9ae1eb562fb2375427fedacb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US4FU1230208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3770004ca52021ca99b35b24cf8f56903da40d2fb7215795c104e0dde6b8179e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US4FU1230212.