Matthew Halsall is an English jazz musician, composer, producer and founder of the independent jazz label Gondwana Records, based in Manchester. Biography Halsall released his debut album Sending My
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x233498a9000c86e9895d7f5aef3df9c04edd75f5ab8f08d760a345dbbb45117c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b21989d3-5abd-446d-b8c3-c3867311ec2f.json and https://artists.proofprofile.net/proofs/artist/b21989d3-5abd-446d-b8c3-c3867311ec2f.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 → block OTSBitcoinBlock must exist at that height 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 0xd7da1051b0e6d548cd753ad601367e722ce59ef1251e627fbf11880325473656. 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/GBNCZ0600200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf256693871e5cd3cee5ec1d4380cac0e1696c2fd89d7db6ba805f267fb26e528. 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/GBVTB1513001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894ed9cda5b07817bf62fd887a3fc30f0824e146c8c8460b63805d2bec30b25b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBVTB1513002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb6da4151d4b07d0b3f68e1b48a113b7a7c457a7766651e08bc2636accafa29. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBVTB1513003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fc66a70510104025c2ce8008b7cdfc1751c7db4940a42490e1cd8b75293e18. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBVTB1513004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b0177cc7c6f278458643f3cf5b38f178b75114e405a4571b01fe2998e90f9f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBVTB1513005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa837edaabb325fefe2122443173a6eb97988497a1ac65ca06da1dfb64d84a8. 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/GBVTB1513006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a29fe80d36af2be7f42db8e3fcd98aa17008e0ce5f52f88d41b2a38882335c. 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/GBVTB1513007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70e34fe402f9d3006f1ce00648b82fe43c391130a7659b7296b3c3d1e371af6. 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/GBVTB1513008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a4481da21faff02c2e8233836731fecb2abc905642590ca33b8fb257a76bbc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBVTB1513009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64fc1bd07f3d03d673475d55aa598084eb121850ef1e00621f9a4f061c109f7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBVTB1513010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbbff02047a3b08f81ad1fb6a1ce84abd1f24ad55e689fd8ffdf96738cd8c81. 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/GBVTB1513011.
When the World Was One (Special Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072051795083077adbab7dddede2d9807ce564da0bf3a0e721a0bcb8c58b100b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBVTB1410001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b694ca0253866b933ffbd07fafded7b3fc7a3c12f7f46c03358e2a5c836228. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBVTB1410002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8428c44401f05830ba328f67e991e7a0938255acf32a165de184a182dd01f2c0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBVTB1410003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0a4a89127c3b5d537fca860f5164708514731f05f99d79a74947944c17c090. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBVTB1410004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10db5871732e632a166ecd708a39fb7c43b163ccc326e6cc4c1b672c740a98e7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBVTB1410005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5532c97e63caba81839c49f451b6c9e9e83d96927946652c6808009a4f1986f. 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/GBVTB1410006.