thumb|David Firman 046 David Firman is a British orchestral conductor, musical director, composer and arranger. Early life and education Firman was born in London and educated at Trinity College of
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 0x53fe0f4aaa4dc0f4ee1835e3a14accab742487d6a44c518508960f4c3d64b855. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8d32f68-0d13-4e1c-9290-2f9134d0c7dc.json and https://artists.proofprofile.net/proofs/artist/a8d32f68-0d13-4e1c-9290-2f9134d0c7dc.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 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 0xb78747031a0859d681dc7f65c4027af5fdb3f63195945243a39b8f5d1a9258ab. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/KRUM70800119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af50d92e529a1500b76b049b2f464a93bcb674b757b4dd88fafcf55ebb179df. 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/KRUM70800128.
Messe à trois voix, Op. 12: V. Panis angelicus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f4cea7801c7cda85419df1d4fd1d18fbc89075f2993a1117b21eec372e9bf1. 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/FRZ209505900.
The Very Best of Rodgers and Hammerstein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47566b0925aaf5a6cf10a9d6bfab941fbfc0120e5fcd3393ac67748d1b98ab63. 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/GBGRH1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d0f93a6cdb8100ada58d67d4f3638a21918b7dbe86bd1b34533c1b3545be62. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/GBGRH1100002.