Christopher MacFarlane, better known as Macka B, (born 1966) is a British-born Jamaican reggae artist, performer and activist with a career spanning thirty years and one of Britain's most influential
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 0x65904b2a883ce42cfc89ef12c55f083484ced8109a5905310701954b77d37232. 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/17c3cd6c-f81f-4cfb-b306-09cb09079b71.json and https://artists.proofprofile.net/proofs/artist/17c3cd6c-f81f-4cfb-b306-09cb09079b71.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 0xf29953e6cd0be5b3f13c1bfb9b0a9ce1ddd6c6b830153bf944809966dd1b2c45. 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/UKSZ92200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2a7b5755a3853184321721ff0fe12038099225100014e5dd1eb370b09c0259. 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/UKSZ92200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b805e8cf43649ff199f38816b63194a6999b9eab89d3fed4022e91f376ef7c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USCGJ2303673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d91e71e48317c35c7fe43c6092ca268d463c6f9691ddebdc9e39b58800ba82. 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/US4T70610401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61dc34ff383af3fa55f0116e7948376fd95b587676408a8be3556f1e8cb002b. 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/FRW571826003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4789deb6a4ba86cb54964cbb2358e5ff2272fc48239a94723351f759f9b81cfb. 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/FRW571826007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d43f14e65ca8c2a1e7e62aebf0514453859b83ac496c8eacdccc83711ba164. 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/FR43T9803002.
Dub Pistols present Welcome To The Jungle (DJ Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef32d29e0ed2bcbf0541473ea0c702bbbf27b66c41c6e22643db2eb6c4588462. 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/GBFG92100082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ded9ac8e90ba0fca913b8756cf393e94d628a7dba5e2b200cd4ec32fc3e34a. 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/UKKS72000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0444cad393a65d213cccb4593d9af6577ad8803784a8a7797b2ba6e4c13413bb. 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/UKKS72000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d3b97be353435a8c2c0f9adb48754497aa6b149d5426a6300487550e9c90e6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKKS72300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fc0db98ac3f470d465204563de2d029334fa63b4b1b5c6137386eb9630f301. 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/UKKS72300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487f4af40bc751f538ac29661b6f225b4806bfaa0592d14883b703a239c2f7e0. 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/UKKS72400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174f5525122bd7ce17a92f97a4274ded752326e4a2930f3c8557edbf7364d7b5. 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/QZPYN2364666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ef26fb8d7577539e2e568c04dc74a701c4bca49b414895bcf3da168668b3fe. 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/QZPYN2364667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f198239012d436f647f4ae2c59fe0ff6d4ec2800a152fe1308864f9176c34d9. 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/GBDLM2200317.