thumb|right|250px|Gerard Presencer, Aarhus, Denmark, 2010 Gerard Presencer (born 12 September 1972) is an English jazz trumpeter. Biography Presencer showed his first interest in what was to become
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 0x6b180ab8cef2a092358962fda652fbad74ec88cd54aab7cd54fd9a6dc579f778. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/718e1223-8bc2-44ed-bd82-729738dfc5b1.json and https://artists.proofprofile.net/proofs/artist/718e1223-8bc2-44ed-bd82-729738dfc5b1.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 0xa6adacaca521d82b07cd56a7e7f5cb8ad6a9a0f4bcf2516ccffa5fa1a6a3e515. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:25:21Z), 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/NLB151100092.
(Satis) Faction - Live At Danish Radio Concert Hall, Copenhagen / 2010
Charlie Watts Meets The Danish Radio Big Band (Live At Danish Radio Concert Hall, Copenhagen / 2010)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a059240d85f39efe12b1e21d47da28d459eb8a30d77d78c9088a2bada17542. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRUM71601923.
You Can't Always Get What You Want - Live At Danish Radio Concert Hall, Copenhagen / 2010
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0131d61bce035d5ec80ac65bc7ba06d48ef38033783ff306ef7aef32565722d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRUM71601919.
Paint It Black - Live At Danish Radio Concert Hall, Copenhagen / 2010
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3cdcf9ffd125353f246e1a4cd822be9cf43e839a71b6ece045d9ab6fb8e1c3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRUM71601924.
I Should Care - Live At Danish Radio Concert Hall, Copenhagen / 2010
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc97640201b61f18bc7eef1c3cb39f55ea795a61ea12f9598baa36e69cbd2a81. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/FRUM71601922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f203be9678feb40c845090cfb4cfb48d9f1f6f4d2e9c6434af438b7395cbf9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLHR52117229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba21aecc1d1eda1b6556de764c32355d6f8af3e6bdfaf793af5899ca2f14d5a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLHR52117232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713efa83244db25ca86ca0ed79ef1d8cff4e5ecc9a43e7531a69099ac02a6e3a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USBN29300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfb6d6fa614c84a275bdb5562e246b618ad70c099d69b2a1992059837316fc5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USBN29200079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713efa83244db25ca86ca0ed79ef1d8cff4e5ecc9a43e7531a69099ac02a6e3a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USBN29300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfb6d6fa614c84a275bdb5562e246b618ad70c099d69b2a1992059837316fc5. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USBN29200079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340c7c7ff93c49b4bb5b14de2869c029a1642e80d5f10f2ebf7606e6b1b6287e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLHR52117233.
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