Matt Sweeney (born July 2, 1969) is an American musician, songwriter, and record producer. Sweeney currently plays with The Hard Quartet. Sweeney is also the host of the web series Guitar Moves. Swee
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 0xfc5c8723211636b7b6d549fbe9b31ea1fe254423bf02973fe7754989a7cec6af. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ac8fcb0-7b6d-4596-8bc3-ad390b7c4138.json and https://artists.proofprofile.net/proofs/artist/5ac8fcb0-7b6d-4596-8bc3-ad390b7c4138.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 0x125c462355fcbd750bb1a167fc9bc972f50ecf06cdc40b92c4bf6fb270b499a3. 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/GBCEL0400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaebc81dcb4806a87655eeb905cb5c4557fb9238d3b73473a2bda06215851f84. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBCEL0400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e0a374cc5eec02d9ca01035d9ba0e813e04c90bc8d640da1cd803cc6d768e8. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/GBCEL0400304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b37ee58380622ed5b59893a656058ccd40dce261154f2722f1069cb528babf7. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/GBCEL0400305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bb9b2b29dcd9caebe31bdd39570fe1813b69fe6d119a9a673fdc2a898ec4e9. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/GBCEL0400306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cd427075d254bdf0c19ab5e38394eed5835c44689e81976a428fede8fbb813. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/GBCEL0400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d0cfa9f0a2fa8c37a6bd56b2e8bbb5717f690f560f209b58ecf8b4cfdf6fd7. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBCEL0400308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c677d06ec8ce3c7ef5c3eacd03306d51d560bf7ede5d6ff8966b00458dc2cb. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZN892112121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651fe59f68712989dd20f177991771abd2a24ebda8b04a0b135635ba9de45420. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZN892112102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d732a6ab315dd35af1b8752c122e788396bbce86daf45e9b1c6ca213038b61. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZN892112109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78c8dc13beae68b660eef80e9b6ab1d7156f02ce936ec7f962a42363f800e31. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/QZN892112111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c677d06ec8ce3c7ef5c3eacd03306d51d560bf7ede5d6ff8966b00458dc2cb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:39:24Z), 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/QZN892112121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651fe59f68712989dd20f177991771abd2a24ebda8b04a0b135635ba9de45420. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZN892112102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f2ea9d65545a0382984bb82f9f840f1abdece3abf2ec4ba56155e317b96b1f. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZN892112104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5c74c0b8ab3a077f45bb71b0ecec701d3e90098b8cc377eecde564a2b37ebd. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:55:25Z), 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/QZN892112105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cc1c29b4a04efb20411da9cfc6f70105b94c84d600cbf6898ddb753a548072. 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/QZN892112106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d732a6ab315dd35af1b8752c122e788396bbce86daf45e9b1c6ca213038b61. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZN892112109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78c8dc13beae68b660eef80e9b6ab1d7156f02ce936ec7f962a42363f800e31. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZN892112111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f9d1b68252aef1f30379f005b776f422273e0c54d4f3c5cc910a153e39af92. 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/US58L2080302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc775d43393242387ea1c159484433badf8758a930b1dcdf7d52b3faa21b82e0. 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/USRC12403180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc775d43393242387ea1c159484433badf8758a930b1dcdf7d52b3faa21b82e0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USRC12403180.