Leatherface is a fictional character from The Texas Chainsaw Massacre franchise. He first appeared in The Texas Chain Saw Massacre (1974) as the mentally disabled member of a family of deranged cannib
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 0x651d9d128003d77018ac9906c9d661c3ef9fa2a30c22f55624b8dff0c513ab36. 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/706dacc6-1a40-4b5d-9558-0ab694085c4d.json and https://artists.proofprofile.net/proofs/artist/706dacc6-1a40-4b5d-9558-0ab694085c4d.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 0x58b7ee3537460f298e5555e6ab5a92518faddc9e67c379da34168185ff6df90e. 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/GBCKK9020101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc871b3d610d7153ca23d9e2612633e7993822b248267ade94e0456a33f12e16. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GBCKK9020105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b6845bb91ef496c6ec4cfb3d7b81cd038486457a92826a9213bbb654c4825b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBCKK9101008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea0621e7d9ff380541c93fd27f6866d6e2ce518fc3e80ccd7df0ab6ac0e41e9. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GBCKK9101009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6124ebad2f1f2d360625d141358a6db016cee6eb7f863e7e785b8132c916ac. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/GBCKK9101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4af6d0f7077dd24e0934025aab5a944b58735823f49e6f3fcc949e2325bd4b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GBCKK9101011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf0417b74e7e70a60d82dd7d024b7662e4adfb4f39cb8e5086ff8e445a7f8ee. 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/GBCKK9101013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39232293e890989f0f127b1ab2933505302925a8668f6a1fa56f220bbf031353. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/GBCKK9101014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2be3d5f6d427bd9e1b00a8b5d43a6cb76af919a6a7744f9e99746a1ef60fa03. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBCKK9202203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9eb438dd4c79ef6e2e8b51abf4f765a2dc5ae60559145521b1387e1cdbedf59. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBCKK9201104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0848f13cca309e598f5863b17cc41f0c1bffadd4842167cef700da81af600b. 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/GBCKK9201112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4b7909bbad7ce7cb36fb6d489705feb912f7e82b4556ae8613871795144b29. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/GBBUF1000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2314d928de6f192caeb7bd40121b4cef5b6cd5d338af35a850fe3e03d8e22cb. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/GBBUF1000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5d7a22bc82dbe77e7b3a6448023813f59322ee2bf6c7d8919890bf65649af5. 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/GBBUF1000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3216b46ccf1993fe473941893771cb4223a210d1b9ef61ea07b0b60147f97a5d. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/GBBUF1000105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce12e35df39324c46325983cfd5923217a79a915e0a8415d031b8ca5f06da930. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/GBBUF1000107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff14392c521fe5c085d6093fc0d55bcb9592b6d9f78d376555a549792709f76. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBCKK1522713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c1140fc19fb11d310aa114df8ba7d13343fc97d8550a663397203f70407c33. 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/US3X59306801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50708d1293bbb9a1196e81bdb75f59c5ca29ec82769dd36fb7345649bb1eb032. 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/US3X59306802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2d65ef84dd869e19a0b8f3088ff06d4957f21847533b0862ba2dfd4b5df1de. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/US3X59306804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f8b00872e811f727d64bdb80e2b90d8b68271ae74ac326082bc317efa10b8e. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/US3X59306805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11de856b51ad057abb90da469ef6a72f0085db51daf59dfeb1786c2b24d12c1. 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/US3X59306001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d97f4cf402a7571053aa0cc1cfe512ea70021101a0639976e82933edd40db3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US3X59306002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf30c7598b97dc8a959fe82853543af33f58a825651367710fcfd0e71b9d5d3a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US3X59306003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadda7be2ca273d657359f1ab23c174ee7dc78305150f3e092122108a91d1d94e. 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/US3X59306004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575f56240e5d0dac796c5eefeeb2ca2ad298159935fe05d83c5ebe0531a10e4d. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/US3X59306005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23dc62c35d2f4886f99ff20de5704668158410b6793799a854234430593f35d6. 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/US3X59306006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f947e5433523512e0f1b63c292d36880f5991cff11e8b7c8019e39797c5a27. 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/US3X59306011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ac37fa433a521a3384f94ad8bf4e2d8042019ddb3688ff26319fe859cd8569. 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/USDY42278869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf420b1a442619a2b51f6de0b931228961be54870375f1d49236697f2937c4eeb. 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/GBCAD2100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764497c7b79bd5c6f47b0e4b7edd8fbd70ac3a9a02597529c612fce0d3bac7d5. 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/GBCAD2100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b55ed856795d509b87c6b9bbbef5ed1e4e51a020b81546e0eed13baea9f824b. 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/GBCAD2100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1f0286128b3f620fd73d6a2b06e58f552518b13065535c989303aba3d0697d. 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/GBCAD2100065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7553fae16954555671886899f6de138728c73cdffaf48c4e15f8283a157a128. 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/GBCAD2100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4c50597f0bfc52b44f3d5e24c5b83914044e42c5641560d5bce104d32b0337. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/GBCAD2100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca2cc2f0be11d948f9701c44a88b9bff942284b7234b074172ce5830d51ec89. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/GBCAD2100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cc0afefeaf3dc9ed25c13d471b489b71a3bdb45ddbc9aeb564dcac0ca1d71c. 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/GBCAD2100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070c4ac4c0424a5514ee635eaf8928bc85d397b4dbeb674f5a2fdd4d7a3bb3b9. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBCAD2100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd609e482933c490664757a55b7436120bfc52916432d357a18d22afe6310a5. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBCAD2100072.
Let Them Know: The Story of Youth Brigade and Byo Records
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4babb13b874402895916937122a98218dc5fe0287658a11c5811846b8c33a441. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US3X59312530.