Nat Birchall is a British saxophonist, composer, and bandleader of the Nat Birchall Quartet and Nat Birchall Sextet. He lives in Derbyshire in the north of England. Biography Birchall was born and li
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 0xfdac716f8fed63ae2de2e99ebe41d0a416c815fec2aadd38f34e766e6d44ecf8. 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/b46836fb-09b9-4a45-a441-1a2eb4078d41.json and https://artists.proofprofile.net/proofs/artist/b46836fb-09b9-4a45-a441-1a2eb4078d41.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 0xd021c2f64359b876e7fea2764fcc558796d781a77a92c1710ebebfe0b64ce951. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/GBVTB0900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0557ab0b54e9da5e94ebb699424fbf9a97072d20ad7a821abd7421d57b4265d8. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/GBVTB0900203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c356236e01f6424854b185fbf9cd788874f41c9b68b93c33cc678453e22720c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:22:48Z), 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/GBVTB0900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadd5633551b45a3dc39dbfe48e045af9a397d1ea854296457fb9efd27e8e323. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CHC262500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda54ea2e0db545096a4f3ea61b26e55d0ca296ed8cdf3065bcf7c7d410e5d69b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/CHC262500008.
Soul Jazz Records presents KALEIDOSCOPE - New Spirits Known and Unknown
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2373774f0e9906510072aaed113f8f5e4ba0ebe49530ba1b60bebccb05d19ca2. 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/GBCTB1106001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3a47095cd35e1b26f2bb6f010d9075867f571f8ee7de11f7aaf5ad817ac4d1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBDRC2423805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccdef270fa04f3dcbf3c949e9bfe15f947bcd4e616721e309c310172317d33a. 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/UKDBM2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1eab3c43b277300098d9cada79ac63c55cd7715b1c2a149916a5fc7543df68. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBDRC2423807.
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