thumb| Angel Domingo Emilio D’Agostino (25 May 1900 in Buenos Aires - 16 January 1991) was a piano player, composer and bandleader (tango musical genre) in Argentina during the golden age of tango. H
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 0x3a34722c7052191f623e946f9aa0ed6642ca3ebdbff47aba4b34c29059c874c1. 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/59f6afcf-9dba-46d6-bf04-8451f3917007.json and https://artists.proofprofile.net/proofs/artist/59f6afcf-9dba-46d6-bf04-8451f3917007.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 0x9b228e95661762ea9f89dbdfa460c67486dba3bd74f84ef241d84c66ce3ef3c7. 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/DEXO52468785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093eb1dfd426080c8acf95d9f046e4930355ba7af0b60bc45be2851ef81fabba. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DEXO52468786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef0e57385d2f463c990ad161779dc860a3debf83e5e84a9e391e4929b797a79. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/DEXO52468787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81e7d5d0f5e4039bcc3d3477b9733fd9278c9b60612a94b83453b2ccdbce6ca. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEXO52468802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8848f56733036712a03047137d6e04f2a7a6a6c2dc066decae6df794e45c0042. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEXO52468808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ac4a4e8760dd7fa6e7eca4ed54dd03f3f223f70458b4889ca8c9e256a8ab9d. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:33:33Z), 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/DEXO52468809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e8838fbda2ec76ebe38b142962d193acb451ceb63a3ee70b8253a0b6e1cbde. 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/DEXN92230889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf13d11c763b93f7cbecba713f77571279ec443276b3f862cdc79e273331c57. 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/DEXN92230891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a917f346bae9311c29f82fe26aeadf2364e54ad81194de8db3247d99900495. 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/DEXN92230893.
Solo Tango: A. D'Agostino - A. Vargas Vol 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b6baeeaba99135b2a7f07db5ace54a554e74e65a6352d1761211fdcd9f518. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ARF039820506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a017fc9e4f0a99424c37b427338822b7d6942cf589378b1e8e9e47bfd76b00c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ARF034100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599670519475eb6735c31cd31ad12127e27dca4428bc07fbce0176c7fb16afd5. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ARF034100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f3dfbda0160a1f15e0e503b3be699d8916bd8322475d5c8092d912aed33006. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ARF039000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f28a1b6755936aaaa3d16007cb7559534675236f55edf295e209ea64ef393d7. 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/ARF034100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e11b23c8fa44feae02fb092fe8b9ce64f09d36021dbbdbd8d34bf6d72436dcd. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ARF034200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47343cb5a4f853588cfa67693a2edb2b85e2180a051af3f530b761a09fd7317. 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/ARF034200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1525f47ceb2712e45e8a3ecf8246d0a7309c5ec88dd6322bf911967cdeaccb64. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:48:56Z), 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/ARF039900354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609f03ea9a3844760dd3bc6b1a0b56cb14320aa6d9f032b5370cff5dd3acdaf5. 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/ARF034400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a69e60722a8bdc2f2dab6d381ea44968454848a93bd22a8991faf396c0b173. 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/ARF034400051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69883f8c642e1cf30fd9649f600cbd7c7a05125dc26ff27d185e794c0cf10ef8. 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/ARF034500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d02f548a7b91fdf31bf7fce3adfcd72c23c89220ff30e43439465308c9cb312. 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/ARF034100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87ca4007208537bb0ced056124c31e07854e4ba9d5a082be96e9673556c52c7. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEBL61231252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ae494e307ac052772ce9b9a6761d43e2dc86c0cdcd4caf2d76161458be25e1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEBL61231265.
The Masters of Tango: Angel D'Agostino, Café Domínguez
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc9148438fb17aeaeaf51e14617d9fa1844f80970e1a45f17babd4fb0fcd66a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FRZ335547010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8457fe1f53217a3242d2a073768b5eecaabf665f4e76eed9ebadfc901a4de0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRZ335547040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f847e756abff96d14e528350434bda78e6456190d52ea12c326a6ced26b7366. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:48:47Z), 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/FRZ335547050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c19fa1c7572d76e247503b4ebe18481787ef226d3b64c7c89f172236ff4d71. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FRZ335547240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda70488f933b59889a816570638c8aeb9c7b7fcc597138a90adc1a168bb41af. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T05:09:53Z), 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/USV291427004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1563b8f72b320fc25777d8eae481c3368aff632500f1df12e008ba613177dd. 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/USV291426989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55fe0ac969176c53bd76a514dbe499bc3753612f0ac0b2443c1e38648a4f011. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:23:57Z), 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/USV291427010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78099bcac11ee4a0e11883ac16929a201a005eeae12e6596bd73c2b1e4bf99d6. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:53:44Z), 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/USV291427001.
Un Tango Argentino (Historical Recordings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a58ca6b2f6c4feb5361b8a93d7621331819f557fcb2ab2f38fd58e79203a4ab. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CA5KR1927114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40945b6a5aa41b2a684275133b046af776094948f96ce36a532870603bc0334f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CA5KR1927129.
Ángel D'agostino y Su Orquesta Típica - Ángel Vargas 1940 - 1942 (Restauración 2022)
Tiempos Porteños - Ángel D'Agostino y Ángel Vargas
Argentina!: Tango Legends from Gardel to Piazzolla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c42dcd4cec861bef38f7601269dd84f9718cf3dc9e11aa3286c600383d6257. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FRZ333309180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72abd0a755e1688339e36c0348f4995a29dcd589c347bcaf4e175565a33f7162. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DEN720100265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf36753fe79723d9e5fdf59562d6f054266c9af7f9354ab2d6611689d5cc9d7. 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/DEN720100274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622100021eb93ed530e0ab531e9c3072b332f3c01f82cc06f95ba74f4b75669a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR6V80045701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefeb0f3796402e0085f03e8420e76dc23df31252097363bdca5ab1d230b3aece. 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/DEN720000219.