Jeremy Cedric Spencer (born 4 July 1948) is a British musician, best known for playing slide guitar and piano in the original line-up of the rock band Fleetwood Mac. A member since Fleetwood Mac's i
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 0x60bfa69a893f8d81c245c21d3d051814e1568a751ea0461ebb032c7167f5b23f. 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/1b505a25-4aca-4a5e-886c-8c80eebf20e5.json and https://artists.proofprofile.net/proofs/artist/1b505a25-4aca-4a5e-886c-8c80eebf20e5.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 0xf3577a5244e1c885de852ef7c1ef9f0443dd86f5be95dd9d90364e80e1b9a151. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NOXGK0617070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3787b8d9683dc2490a31bef010956d0063854b757d68c6c22427c49b0f69608. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:14:47Z), 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/UKD9X1600053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5e27a22799a2458a601ca3f98f5e850a4f9f08ec4f60155bd00e9e6d03da34. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKD9X1600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ceb8d06d2ef0ea7343539f51b8a008cf72ecced9205e19a36393075fea222aa. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/UKD9X1600057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d342c630461b273ec4d3948f611fd27a0cbaafc267ff3b61b186e037d932fd. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/UKD9X1600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c51148e918fa58f1922e99c3ee30c3b72588c39067b4048df6e9b1a214f6b7c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/UKD9X1600062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0efb187d20f01cac55410d7796b19370a5d6d649015ea4e66d97db1e525701. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKD9X1600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa0f57f687f5b006b760f29b95a437ab6da468966c37db6225fd18f5e9777e0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/UKD9X1800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9dbe82c9ab3c82ec26a6400ef8ad2a18588ac4b1962cccbce91d1a3b2d9594. 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/UKD9X1800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3448a8bb5bb10d28b67f25a5b7f43b3fe6e1fc2f5f12874920e6aab8afd25841. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/UKD9X2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb23696411fd5bec1756c2ca3528d60baadd665d5735a2bdeb0d3378ddcf487. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKD9X2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160535a3e27d5744766b1651f087c79d5ccfe63404c754ee0b684163f6c7ec60. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/UKD9X2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0679ee41770754b15aff9dcf56a9756983dbda3042bfbc901b33496d11a4ff. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:20:16Z), 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/UKD9X2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89f37973cb5c616a949bea7e613e09fa9ac6e66a0819c4427a98db62a72c51. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKD9X2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecf4ae313ce8338aebf56d332dbd18ba328a8b4671d10c7cd8e054780507223. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UKD9X2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf149cd86b7b1044e3104e1e7aea775104d275a08809db65dcce47820a6bd2110. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/UKD9X2500013.