Mat Kerekes (born April 22, 1994) is an American singer and songwriter, best known as the lead vocalist of rock band Citizen. He is also a solo artist, and a member of The Flats. Biography Kerekes wa
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 0x61e4c5a1effc7463956f696016dc2eda6a67bc923b6a28d638f3170b34a2f184. 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/4100ac78-1149-48d3-8773-8c02236d108f.json and https://artists.proofprofile.net/proofs/artist/4100ac78-1149-48d3-8773-8c02236d108f.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 0x7f5194d97b09f3ab52e23d2f99a97fef122d83d65a35816bc8a6c36016d604da. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USQY51478678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00cabc27a938e5d112456b2bd131954538b6829bd1310a1f9de7f23ed7d56df. 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/USQY51478679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b570328ad93ef773cd47db0be72538ddac489c788532c67b16706d5d0b8d0da. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USQY51478683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5759546c13471493dda74ed7fc45b90f0c72db7618aec9b227a7683c7926dc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM99V1704204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c144eadc59256b54a916404c14879866601ebace9504f2743e57c6527f6e12. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/USAT21811661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af4ca9a7f160cd09b27ecc0ae760bccfad54e7da589cf55ec01aa80b4717ca. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USAT21811662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c0312b69672c1bd6eb4016dceb3d4b2732127301b457427ed068afbb5b1c9b. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/USAT21811663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa2e6344315f4a4802e833e27a2a3037a7c9fe2346dc239265795e7f2809f4c. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USAT21811664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b39e09700a897ea8cd834432087b9aad9f7b2d69149066d3ff40ecf3d95f1ae. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USAT21811665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16be8affda9651babb403008e56b6ffd0acea0d90da57a8b8a97fa878185a215. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/USAT21811666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b0214e7c4e55e0c5728c392866ae18dfa23b1734d93e390695dd328d6ba1e2. 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/USAT21811667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d52874030dd41af9bf061fdc46ee231fe54f59d2cede7bd126e9e7b895c332. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/USAT21811668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21af699f1b36036d6c26944ef13a97ed27166d4e7019d82c2c6eef346e37b5ad. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/USAT21811669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2faeb2e6294f8d64b2cbe4233afdac6cce71a1bc0c71df8f6a1ed003af49c297. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USAT21811670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb283cdacb41fcdf604625f7e142c0b1af811d04dc6ff08a864e46b1912fca200. 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/QZDA82092607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeda641e385cbdc6a43d3bfaa1cb250ac83c03d7089649a8b8a7820a3bcee36f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM87M2001301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa7550b9f3dc50ac33289a6f3b079b63e7b6ed7a08ce23d5aba9e670f9bc01d. 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/QZDA62062077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735d60b78ad5798598c07c20665af3802ce2f7874988ef334ac97fbf7de3ac53. 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/QM87M2001305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0f6072e0d7aa58a41d3b24213d984c82c852d0aab803437e9b6b4dfdeb76bf. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZNWP2001501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb94aabff2e9ade1eceaae9cd2f15792b21285e0198b882bed587131c1581874. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/QZNWP2001502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9568571f3fbcfb947e675baea9d2f2fc899ade912eaab618a268ea9bda2a4ae4. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZNWP2001504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca99208d9f211e9c6b4f27dc92304a62a4a5ad62c669fe58d3868e9a6befab16. 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/QZNWP2001505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49110686300e8d4173d452c5384c3e274e1cbebf34fb0ca37899e968d7d5960b. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZNWP2271001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12932bd0695d4d669ce24c6772f7a1ca606ddba152eee500fae4934948421c8e. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZNWP2271004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f590acc230df5ee51a98c137a0465589a5df0f7c40d30b49e078a0e89dbf4de. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNWP2271007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bf2e228852b0ccf287ded01b182f856cdf79dab973b4e14b283d1f472c445c. 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/QZNWP2271008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df892585b93e9c6c7dd44b3b58e4969ca50a80ef2672f1ea1d96429878d3bbb. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZNWP2271009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7b0c7ad6834dbec84315cd6431b9ced3020c1f42e5bf131e32035d996092c8. 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/QZNWP2271010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2a9dbb45a7114d71494826893f2719e5cf031c2aec827d7ad29a9620194816. 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/QZNWP2271011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdac5eee0e16fd19cd7d337f77e503f233da68b0be4bc0ffb255c1f6dd7e0933. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWP2271012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1879c708524553d16c7ee48815b6652ead896295b6dea43f8a7823f87f94cb. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZNWP2372902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84cb789edfac610a7a6cc7bde1b541a3db2a9b9045103d7c6cb6bc079f2d5972. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZNWP2372907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72451559f019c050ccad6b31c7721c40688008a2e9e5284ec92358186c84bb55. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZNWP2372908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38da3e3f3da9110ec72358b6b17c655b9f72a2cc691c455377b02d26de505f05. 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/QZNWP2372909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f65006bcf3da0ee5e5e02f01e5ae1d97406dc94d606287f6ffc9e7ba9fd067f. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZNWP2372910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776f300acb9e354641d4fad0ea4f009701d432e2b333931f422a382ed75b3428. 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/QZQAY2348902.
Off The Board: A Studio 4 Family Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a1534e87dba905537509df91508fe5a935c8a5bdfac76a4c93f1b0ddb8f86c. 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/QMCE71300628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776f300acb9e354641d4fad0ea4f009701d432e2b333931f422a382ed75b3428. 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/QZQAY2348902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776f300acb9e354641d4fad0ea4f009701d432e2b333931f422a382ed75b3428. 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/QZQAY2348902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776f300acb9e354641d4fad0ea4f009701d432e2b333931f422a382ed75b3428. 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/QZQAY2348902.