thumb|280px|En Tol Sarmiento En Tol Sarmiento, also known as ETS or E.T.S, is a ska music group which was created in Yécora/Iekora (Álava) in the Basque Country in the year 2005. Since then they have
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 0xa5c9c90aa5ac335e8ee6d2eceddb87ada9a08e1412be0ccdda32fb9b52debc20. 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/1158734a-689a-4ca6-8eb8-54f414cfbb00.json and https://artists.proofprofile.net/proofs/artist/1158734a-689a-4ca6-8eb8-54f414cfbb00.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 0xde4c32ebbbc3a4add1edd2b129a9128e7b9f0e4cbf2ef301ab60882faf966a65. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ES21A1200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b53a2d03903868ba164aa62fc05ab167e28f131a3317014cd4b9d3d2b28b3a1. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ES21A1200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3beb3546ffabc3820574cd93fa2e8b996de5e75200c91364c14683d444a02105. 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/ES21A1200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd42ef43dd39d2be0ec427bab2d0c8ec181b9c98714f5a9c621baa859aaf422. 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/ES21A1200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e6ab07a2b07a8211d4e3e234e616c62ee647d96e91c59d25087cadfa8f9fc9. 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/ES21A1200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eec5ec60c4c045b9dec4b28b5174d606cfaf9eed3cf73adf92794d5a601e1d6. 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/ES21A1200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67f40f2cd1b7dca2ae36794478d3f601e895d3379cd672fb36712ef5b8aed7c. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/ES21A1200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572f55fe61e22a364b4bf13593427e1dc4261a604d719e8b6df7227253b6b2d1. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ES21A1200078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575b8b591725a101bff035471fadfd2974e8c1b0937272ea0b62a1910ec27a15. 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/ES21A1200081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff1e626b460919a38949115c4010e70bed4e8e5915d390d4a8f7ec22beb41e5. 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/ES21A1400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfd7d351f037d3aa03eb33266ec9e0eae73c81b9e9b5fec9f20d3038e995d08. 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/ES21A1400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0608e07373cdcf0fd9929be865c990b40da39d9a871335e615584af083532a6e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES21A1400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd81f50b4fdda8aafa7078f7c430ae9147269c27e701b16fec1832310015690. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ES21A1400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4ba53bf9f93564ff5793d5b0fed9e904023a5f53dcfe7f32fcbffd7a5eeb82. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ES21A1400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d80e19b231693e1c33a269961acd038f5c42de3a1c14e320f84223768f61a4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES21A1500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed4e866a5f434a483a491e6d999e977e3c52fd349ac16ece531c4648f368203. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES21A1500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b527914064e4ca64599ab26e3d017400acf8868aef3717f19ce863c07c0d6d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/ES21A1500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ddf21b705f324fbe453fcb4742d68dc22f927a496dbe4b6d9a32f36887dd92. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/ES21A1700051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b998cf646bc586b5fd774725ace5c408ba23da0e43b1319ad23651c6ff710f. 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/ES21A1700085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc464b1d6efc22275db9ca61082a4fc943044295839b08dbc970d50c8b9d0f040. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ES21A1700089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e77705886ff7b1eb0157f608ed066c5115d4a239aee92797012cee859f801ab. 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/ES21A1700092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90823a4a149dfe4e9263448a7e380351191cd02c1cebea278fad855d21b6915b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ES21A1900071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabec2351997e7618682117f8c2ce06293785aa26033ee5b558372d5aa7d07024. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ES21A2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43844954c62ac8c7582f1aec73099afaf06355a59df41e7378c495465c998f9b. 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/QM4TW2274168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df70752ebe7494ba562a3879543fd4b8ab50feb8776d80f4a8fb44e75372bc5. 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/ES21A2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44401870b1c625ff75a21ea604491ec7fe0c021d89c78bc5bca10d3f60e74813. 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/ES21A2200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211b524717fd0efbc7d666ec8f0c6fd14cda4bd6427b1fcfd1ed7e91e8363f71. 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/ES21A2200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99c270255aca927ca0e1c8f399b75615fb8fc3b53a5cbc6286377865004e867. 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/ES21A2200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42894f4b00f8c1a5f5b31aee6263b78d4bc5e900577b60323440ac37ffcfd5e8. 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/ES21A2200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4e3517271471745f8024b8872ee9954d2ea8669a56130c90e01dccb7f2251a. 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/ES21A2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49b8e327b2e179f4b9769b0fee1269d4f48e017bfeb405c60c128c5cafe9f86. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES21A2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb6647997036fd6cd4adf6a0a96dbb155f2f8acdaec05f435bd38f919eaa1ef. 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/ES21A2200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed79cc9db7d82df3fd459269e38ad9794102975a3c4be75567ed6bf17ef4179a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES21A2200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d1e7a16bf8c606dc7dfe12f8aca57e96f01f2845cbeb0d09b08de38812803a. 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/ES21A2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3dcee389367d62b76f249b771df46611de01bcfe01244213e3df5a39fb6ff1. 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/ESA012589426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3548c62b9350f85d5699c4ce1bff99ceeda975d587f82a37ef9a688ce2e22620. 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/QM4TW2255423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cd28da7c862acc2390066721661e41a22611c8069b10beafd6e4d3ebb7b7c6. 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/ES64E2304936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4d7cf78d34851264cc6fd02e884bf46c94e7e6959e8545d3dce9b9ab3c4f36. 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/ES5952106542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd09d093c5e8d37353894067775a61cadad2d6f5cc76cc44ee4ca650499ea31b. 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/USL4Q2110959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc746e8bc24eeac8df478278fc08f5ffa2dd27964661439de2b527327d1091f27. 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/ESA012557390.