John Alexander Crawford (born May 31, 1983), professionally known as JonFX, is a music producer from St. Andrews, Jamaica. He has worked with dancehall and reggae artists Shabba Ranks, I Wayne, Vybz K
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 0xde3ef3787957ac1035fd58f3556f41377287e43ea94d1c0e1ac014befde39d6e. 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/1eb8b3af-7d99-4468-bd62-9bb16434c49b.json and https://artists.proofprofile.net/proofs/artist/1eb8b3af-7d99-4468-bd62-9bb16434c49b.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 0x680539496dff27399610abdf23e708c4826f3aeea1114b6375195807c363f1e0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:56:17Z), 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/QZQAY2427881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b9b3c3035b1b5b4d5ba3bbd9689c84ca1458e538c933b9f9517b789251d0b5. 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/QZTRX2395663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf4580442a1677297f4b1f51a418a5c150e217ba9390b22ca7b276a4eb99b1a. 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/QM6N21738622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cc4fc8d30fe6e18e467f3133e83d32e1029dfca19f9c0f20b5f42d881ca248. 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/QM6N21738619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff0840f247b80a5496aaeb4505a9025ccbee6ea63e85bcb243011f8d44cd375. 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/QM6N21738618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e53eb584156a235413fbbd97ac5039dd334ad6e5a089eef2ff3b374130a8333. 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/QM6MZ1765303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba08ba824383bb66ff786900c7c7e31e6b9cae1ba17262342a951ed105d8201f. 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/QM6MZ1765304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264af763d1ef430076b7a8296897b589f0529a158093ff0caf2758972a47c11d. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QM6MZ1765306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94c75d2bc8c1e72ba571a1361b897127107442b26e8daa4f5f25733d829934f. 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/QM6MZ1765307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25a435be3bed29d978afe30e540bc3af3399bbe5514a49054f7c4494938e469. 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/JMA272005226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddb4cb51f865e5789134f6d5270ed1dc2608645619128d99e4bcc9ceaebe695. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZTRX2395662.
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 0xf9538b9f22325791135f08a8963c18e6b1926606e6f4b57fb2330ea7bae58f5f. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBRKQ2240864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194810a97a9a5555d2d96f0e40739aac3411e31ac272df942cde67760744d36a. 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/QM6N21738623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00310ebc5c3512e6b1d500ca6ba02d13bf486821246af43897e03f67eb33a7d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM6N21738617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc830b2fd434812e3f4344715ad3d4a34cd69f1b27dd699e94441791fe9267297. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QM6N21738621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbe0faf59ba7bfbf862992c03905f7461bb1970828919239cb26be279cc5fbf. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QM6MZ1765300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ace33bb1840a1767cbe9e543babf457fc06789611803c070bc97d389f58270f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM6MZ1765301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa280a15caeb7ab77b9fbf6ebe399d659419e577539824fd46c121c1a8833590b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM6MZ1765302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6efba08f61afb3c70d1431c3767140ff404636beb0d4723d14f4a060edd77c3. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QM6MZ1765305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aa918d4aae33eccc56c13fa3044ed1d09afd948e1ff21626a034b0ddacf078. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QM6MZ1765308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef6428421022d1245ad6c71d37725b28b5c8e744c074408afb8a9692ade8e76. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBRKQ2162839.