thumb|Federico Romero c. 1917 Federico Romero Saráchaga (11 November 1886 – 30 June 1976)El País (1 July 1976) was a Spanish poet and essayist. He is particularly known as a writer of libretti, prima
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 0x816669ed605d246529793465a1c664ff36df4aa8bad9814767cef469d980f3e4. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2ef3988-f2d3-44c1-b6a1-7311ef19de91.json and https://artists.proofprofile.net/proofs/artist/a2ef3988-f2d3-44c1-b6a1-7311ef19de91.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 0x6188df9be0a0910216cf9d7fb8d848542f41426ff7f6df7d2ba488476a0cf60f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES5279901203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fb047cf7170a61bc1f32843cc45d59797fdee8d9aced2096f2b01eb22a5c20. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/ES5279901204.
Monte Carmelo: "Profecías de Mamá Dolores"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64252a6c91a4c94d21c2f5a04491ef13c4e5713c52fca373aaae5b2b0366ab1. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/ES5279901205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c783e3a41593b5d91823eb6fa1b5528e94c0d450838c64b722a490de441ef24. 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/ES5279901209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2081b08326af1106c9ee6ba6956cae99ef7be35a75c61ff3e421c6e71ca4a3e0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES5279901202.
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 0x40932446f5bef92698be2fabd63d5a9512b5ed8a115c0a24a20c984ec0bd4d60. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/ES5279901207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60f381875210b0ed77bfdc945ea25faf051dae35826daea7f747df485b3c358. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES5279901201.
Monte Carmelo: "Dúo de Esperanza y Juan María"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb2c6f5d49d773b083ee3403e88e4bc6936766160ee670711a4fb1010a140ae. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ES5279901206.
Monte Carmelo: "Dúo de Manrique y Juan María"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8e6c6cfc68454a123d66fe986861ec96e9e79f1514d6a756ab9f01df2c468f. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ES5279901208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e30d7dbe59fffc7fcd13de2d0081d8bdfad06925abed07a915953454bb3580. 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/ES5271107001.
El Caserío: "Chomín, Manu y Joshe Miguel"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc753b4ec6c997b0896b8fe9314f5b161360559706bb8ca0148c0e6c2f35ebf5. 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/ES5271107004.
El Caserío: "Los de Elgóibar, Mingorreta y Lecanda II"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c8a18498263b49ddc851503376d353361441e58ab9a5a2fb894880508936f5. 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/ES5271107008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5339e21223035d16e950cb60dd746d3ccd9fb7c23797e82b45fc20a91db5bcc. 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/ES5271107010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea57455270f0b2c47096da4e5a96a07430ecc2177b1ae1338e3c4541e291dfd9. 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/ES5271107013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1758f4a801c79c40d328d796d7bf03b42011c25f26f2ca381dd313fecf636e08. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES5271107002.
El Caserío: "Dúo de Ana Mari y Joshe Miguel"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1158ccbb308875d3f87cf1a83f59852104cec05229d08a78dc0bae6bb34193b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES5271107003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d73fc7989c8b21c1c35ac5053b70349e73fc36b169cb3292854cc3330b7cb1b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ES5271107005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e03ab67a260eb3fc12b807092e310478bb28a276c7fdc182134defe5646e11e. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ES5271107006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3e3023bb0fe505a0bb989a3bf52ec6cd9115daf82803d7f2b6b793cfb74f4a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES5271107007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb22315e01628a6e9f1f3728e9f6364b058334d9f2161860a89da6281a626c7. 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/ES5271107009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbc068f2a7455e716fee8618c486ee17ec0afe081978206f46c0e02b14583e1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES5271107011.
El Caserío: "Dúo de Joshe Miguel y Chomín"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af93a8795c7d25c911063b781cc50da35efa79d64468d50c0ee5f05ad0002bf. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES5271107012.
El Caserío: "Preludio, romanza de Ana Mari y coro"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffbfdb1f560f4aeac2e695aab86838d39fdcb170410dda751d053a4f15d2b58. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ES5271107014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e43ac17fb0dbe0229db1e7870dbfb9fca399647946247d5f8955faeca549bec. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES5271107015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc9f4241085d106292ba0ec58f80b44420c56ae4d7e75af806d10c087084f37. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ES5271107016.
Monte Carmelo: "Granada Mía, Ciudad de Barro"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a54efd3ce6c942cd5084909ce0494667bdeff304e09b021b84d6ccf559c07ab. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5831303814.
Monte Carmelo: "¡Guarda, Guarda, Guarda, Leonarda!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b66fdb449f4c1b7dbeeff8869e841f0644ccef9f4b4c6a6fd47fed1e472c9f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5831303822.
Monte Carmelo: "Mamá Dolores, Haga el Favor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3603a6d6d5a0259b963dde404d82b63cb2e267028e966d12c77dc788141d728e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ES5831303818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0de78388285d061964f5ce5fe726aaface80912add8e66e7379eee39eaf753. 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/ES5831303816.
Monte Carmelo: "¿Por Qué Corres, Esperanza?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf802818c24627fef1dd9ae64f39e050572be5bdffa8cf9a04306a75e7ce5c35c. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ES5831303819.