Luis Alberto Spinetta (23 January 1950 – 8 February 2012), nicknamed "El Flaco" (Spanish for "skinny"), was an Argentine singer, guitarist, composer, writer and poet. One of the most influential rock
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 0x433e5c3fffbd24a38ff9fac26053fb1df9e8a29ba21ff028fb3a23efcd46f3c4. 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/c89b5c84-d8e0-4c9a-998f-1633e1b84911.json and https://artists.proofprofile.net/proofs/artist/c89b5c84-d8e0-4c9a-998f-1633e1b84911.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 0x03b0e9441a93a218494a2285d0293f77d12a8a8b97438b2f0ad14de8d7c1d2d6. 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/ARR9V2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a37306c9da29646c90859af0ea2155eff5e6e99516ca2bb815508d7972027d1. 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/ARF020901770.
Barro Tal Vez (with Luis Alberto Spinetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7394a747910f7d8de6bba41b97f95be3e19e51c7e3dd3957bd7ff905dcf1a085. 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/ARF100900080.
Cinco Décadas de Rock Argentino: 1966 - 2016
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c5d00781d004a75e2f3fcb543cd48a84d900e567eba44402ab647f33a60d29. 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/ARF100200090.
Cinco Décadas de Rock Argentino: Segunda Década 1976 - 1986
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb940be0bc382ae990a4a5713c9209356910e2e86380db7d217aa47aafcc3f8ec. 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/ARF049600386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9f98e7ad38371184c81c84801056aba124232817162030d41a724732fbaa65. 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/ARF098600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3812de83933e731c47bc042f2194ff2944eaac5f98a4a64b6f8d4375c9128173. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ARF049500456.
¿Hace Cuanto No Escuchas Rock En Español?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a90e1031507a6fdeb26d9321a5797b8695f4d2488b89befb475a1b6db269f6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ARUM70500086.
Cuarenta Obras Fundamentales (Volumen 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9f98e7ad38371184c81c84801056aba124232817162030d41a724732fbaa65. 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/ARF098600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7394a747910f7d8de6bba41b97f95be3e19e51c7e3dd3957bd7ff905dcf1a085. 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/ARF100900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306842897cdf5ca02d990ce3e477c61adfbcc0848485252a285f48684fa1d735. 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/ARHR91600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e8dacbc2db9733b9ab54719f2a49fe1e6b7963a00d95d06fc3206406fef2a6. 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/US6R21218939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb940be0bc382ae990a4a5713c9209356910e2e86380db7d217aa47aafcc3f8ec. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ARF049600386.