John Fraser MacPherson CM (10 April 1928 – 27 September 1993) was a Canadian jazz musician from Saint Boniface, Manitoba. Early life and career MacPherson moved to Victoria, British Columbia, as a
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 0xccabdaf644f915fd1587defb031515d84e50ba48870b24d640b4fb78db223d46. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9227ed26-6fc0-4f26-a758-9741acc48d53.json and https://artists.proofprofile.net/proofs/artist/9227ed26-6fc0-4f26-a758-9741acc48d53.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Study Music: Relaxing Jazz to Boost Your Brain
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 0x532bbbf637c7b3c792a1d1451d78063e1e3b5493f227a99c17e49476a8d1e171. 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/CAJ220726657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50e936c8a2e8703e7b8e288db86ff56266dddd933e3740382c5f1415847de84. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CAJ220725639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8922a603b84343b9a9cd7dfa37792f5d824f27e03b0ea6ff3ed583319bc016. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/CAJ220725373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0654e700580d6473170f3516b5cbfb44d5073f7618e0516668b58d057b75b188. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/CAJ229509030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801bfc5bb34213bc08762292e0234ad7f59704842c00e488eb7f043aff7cac41. 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/CAJ229712910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63359131d545c65c745ef2fc70059262bfda0a997bc6870fcadc8b9bd3cc3b04. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CAJ220725315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cc5705583fe667f35a5556bf55e639774fa2d60962f41ed5e1d6de85895c02. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CAJ220725757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42fa2ad46f6deb863023937f9aa20ec77d6014b5aaed42b80d4d22cd96cfa2b. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/CAJ220725530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548f6350241a85784ce0f0b007598b12125580d30633bc5b7760c8f8e9b440d0. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CAJ229816160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9c453f1debd6ea172b0a15bc68f59b9196523de9b28d2fdac950b04f08035f. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/CAJ220622751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050dd2f481bcf1d5f64a986e47c200d76b2f947d3bcf1d1f71e2d9d0b11b1578. 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/CAJ220725824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bd2896e4c8dc8d4cd5a7141c1db82f3f86fad36c0f85329653a3fbecaab1e4. 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/CAJ220214580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5335431e8e4869fa237ef9dffd9c4dfb82a544ab42760f5c076a0c1984cff8. 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/CAJ220726002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12916b42405ac54f39943d4f63aaaec47ec4d42fb81be8eb8550dddae4c830ca. 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/CAJ220726024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67441bb08f28823845fe7db29b3b84890f7ccbb5f576dffbd2f141a0412ff98e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CAJ220726035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2af0dbfe73287aff65b036e36ed241fc1a8ebad18ce226344550234fc6b293. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/CAJ220726057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bfbcacfdd870bc5cb820566791dc81339a03109d7afe44723c50e4ae145d0c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CAJ220726080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade0979824bc5461097724b2b6778c33c808100b6538543ebf62ff88350803ec. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/CAJ221600124.