Aníbal Carmelo Troilo (11 July 1914 – 18 May 1975), also known as Pichuco, was an Argentine tango musician. Troilo was a bandoneon player, composer, arranger, and bandleader in Argentina. His orquest
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 0x8853f23b28af93799f6d21c587dbc9183c92e09abba85ad6eee16f56dbbc431a. 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/f26b2932-d1d8-45a2-9f28-0b8d96f6fd8a.json and https://artists.proofprofile.net/proofs/artist/f26b2932-d1d8-45a2-9f28-0b8d96f6fd8a.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 0x5c57fa83deec197047683c8cfc933bf08a5cc92336ec0bbaa3bcd402ec854697. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/QM6P41414926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c1f386f8e5927959f429096246124a4134bea3b49d1a9fa383484f878edb17. 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/QM6P41414927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13ef72b579fd54272b111115cc01a3b213e31b09c79c9f49f81cdea594402c2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QM6P41414930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8868bdb95b2bb7488eb5e5e561ca053a44babb5268896bf87821ddea15090d5. 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/QM6P41414934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9517d03e099cfa3b7ff2e133d0944c69b184383a748a89491ea23b6013f98a8. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QM6P41414935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c7d8b0483a1fd214010b10076dd79594c3a557eb2f7b2ec317f2aee26e36c5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM6P41414936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b7d3694838c21caa815eefa6f789cf81e9654178567b7d52232fc5fecef154. 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/QM6P41414939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd277646cd18c5b03bd79f6bde5869f971b8c14395079a8a27b51ac81479970be. 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/QM6P41414941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf1a60e758535b77a6f6fd5bb1a85528fc649241ae41b9773cc4bbfe99921f7. 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/QM6P41414942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acc740eb8ef10446f8848725b4aac399a750c5e6c9c63f6761477df6ae2e9fb. 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/QM6P41414946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05b9142b2ae6045b1e26bb359ea4237d7f4c136ed328c7ee1348ae97419246f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6P41414947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7152193f758f2ba33e31f46b2abc6856d1991069881671513d3e670c529a9511. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM6P41414949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0e7859a46dc43f1db0f446e9cf311c86e7546d09e2180b3ce3fd610e648bc7. 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/USV291464269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b51274eb0a09ede5ff94514d1af4631e7c0329083cd9ad1439028661a5aadd7. 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/USV291464273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b01809f60ccb102f86488dc6cb88bc2dd84d6867e627380b9dacc076d0b931. 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/USV291464279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0ca9f874e3c486328ed83c9fa214776dc35b578f63f3e404e9f40966532d57. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USV291464280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b362f040b9c80d4607869683c591d063e7003ca5cf47fc06c44dc1c58840b0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USV291464281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd037bdea2fe85e23ac35edd918f2eafa2bff61bf5cc5863976b45ce0a6b045b1. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/USV291464283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e66c05c39cd6e9611c2189ffa3a24c73009c57770986defba65f05fd556c922. 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/USV291464284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa58773a49706403189b62cd4fb59ee8b950a861bab4699c98e1fb1789c469d. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USV291464285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a6da413ff573158e6bfac99104c9dd6344bc938e6d785ab6a71a954fe6f105. 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/QM6MZ1489648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c1ad45c385be34a30769bf09857df611ca9163231ca0cf73a73e414615d0a9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM4TW2483706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3e89cb549ebe9a7659fcb53667b4d2f631d44cf291314cdc1ccbae8a1e0d1c. 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/ARXP71605258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e25416c46a80e7ab386b750f8f024176df2ad553ff010d41ceb0d897804c7d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/UYM121700961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ae69154e8326925f85bd23950b30564b5cf14dedf040d58cd9ae4393d3a5bd. 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/ART340900182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d8585be55842039a3b9bd172873a28eaf3e16947065bb5d91f0027f0fa9111. 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/ART340900207.
Vintage Argentine Tangos (1928 - 1954), Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7fa6c062af4f0f8d273ec32e83694e724b3ead5a9c2423dd961437065f8add. 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/CA5KR1575295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb394110fe8cf094e136c7bac3a41c6c774d568beb4a8869704a98647bb1e6b17. 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/ART340900194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c02fd25e827a7c2a7bb142e5de4d0981f2bb78e9afa7953995bcc036fe72c9. 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/ART340900217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec34658e8e43d786071b5a232bf65a8b1384d171d24028e6f95d1be51f3fe8c. 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/ARA821000543.