thumb|Blind stenographer from the Overbrook School for the Blind using a dictaphone thumb|Dictaphone wax cylinder dictation machine thumb|right|Dictaphone on display in a museum Dictaphone was an Ame
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 0x84aaeddec72020fb4c9868b3fe54501a3f9fcae1c42fb3fccfecb89fbbfeffc2. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47791a41-0e38-4a6a-8616-c15f0d05d5e4.json and https://artists.proofprofile.net/proofs/artist/47791a41-0e38-4a6a-8616-c15f0d05d5e4.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 0x2ee9be2c55cda36bff31db6abcc670c43ef5b090de8bb9e95395e65b2f5e9593. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/DEX700200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7ecf2fc0364d8339a2c5cab8ba4c3cab943d2c4ff8808729f585fb05c100c8. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:24:18Z), 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/DEX261281302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77951d0a193c9c9e99a067acfbe6ccb59c2cbcc6cf52b4674c7af8d3c2bf104. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEX261281304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3693cefa995698c0f13c33316ccd53f5112df8d207da57a07b66c214997e5e9c. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/DEX261281307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f8254ef5cc727d0f8a94de630b281139e07fe4ef1cc9acd712ce5de0806d4a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DERK91728803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743c6e4e3168c74e25de3e42c91daaadbd99b8a6a3dcd35fdf72fcec7e670cb0. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DERK91728809.