thumb|250px|Chango Spasiuk in concert in Warsaw in March 2009. Horacio "Chango" Spasiuk (born September 23, 1968 in Apóstoles, Misiones) is an Argentine chamamé musician and accordion player. Spasiuk
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 0xb5a92ba7e44fff75514be344c4c9518f6dc90eb12541dcf8dbe960155d4e78d0. 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/b2c4af3a-0abb-49ae-8eec-b73bf06bd3e1.json and https://artists.proofprofile.net/proofs/artist/b2c4af3a-0abb-49ae-8eec-b73bf06bd3e1.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 0xf8cde926c2b45ec9242e3966a1d2fd20ea9b53339045cdde5ed6f26e914fb237. 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/ARF101800519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d427d1db7f137342cc737d4c0ab388c7a66bb06f33da0a5ce69ef192a17591b. 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/ARF101800520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08851dfcc6b1e3bec68696caa15a9bf60f4b0f3ec0efb6095530e88a69441e4. 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/ARF101800001.
Camino Alegre (Besela Doroha) / Canciones Populares (Tradicional)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2f3161a5814c71c9c54e69dad83f96eb7a5d6abbdefecd7c417f6cb18483d6. 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/ARF101800375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6cbd986c8f14237c2d613af79222c3e70c48d58bd2b998c71deb78257715ac. 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/ARF101800521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdead47d0dbfffe9122c41b4da6215ebed0761052a1a53a81c48a9568a30d4a53. 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/UKXN22330743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd35e4a3f2e177b065d6c9920e8aac401585cd22558f007788c076ba4a5075b9. 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/ARF101800523.
Schotis de las Tunas / Sueños de Niñez / Fronterizo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54dfe0b22dadfe845620e8f137a55f5e148efe7df4714a010706c50b0cab5d3. 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/ARF101800385.
Acualera del Río / La Colonia / El Camino / De Barro al Cielo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179dd21384fe42eb179c098b3b8ce1f7691abdf16b5de3ce0986f53572e1add5. 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/ARF101800524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdcabd528fb03157e54bc85d643c7a16c2e93695057373258604cf862f70496. 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/ARXP72410011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16253d2d734a77d885d0187b1500e5bfef3c7a607711e8274cc4337b22b9b5fd. 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/ARXP72410010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ab6be2617cb73bfc556f1248af2931fc334e1462acd5870b8a3d378cca41f2. 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/USCGH2025091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10d5010f89ec5eb2d622fd332d95c6b23bdbc3e898a5b1614bad7aa53fa96c6. 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/ARCS92100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5d24a1c5d99d5a7ab389100299c4478e3581f3029c6d2086004c7156677bc5. 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/ARCS91800010.
Granja San Antonio / El Camino - En Vivo en el Teatro Gran Rex
Granja San Antonio / El Camino (En Vivo en el Teatro Gran Rex)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9a3ab2fdaa94110d8e4adc5e301ecc63cb4622e4bb4a999ea8d40fde4efaf0. 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/ARCS92000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f89573fddf9c2b26e7bea1402c136440a839a3ee2fb6efc783dea85389a50e6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ARF101700146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecea14c2b61819d92fec1890ec081f35a1d68c47d9a708251bc0f902d3824f7a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ARF392121011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9149e7eea452cb3dea36d845f1721ab6c8ec4fd6d7ba5bce7e1a632b812866. 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/ARF099400012.
Viejo Pescador del Paraná (with Teresa Parodi & Chango Spasiuk)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedf160b637aa92eb8272874cdd8d39c9c02006b8ac8e5a12d91d3334897e36f. 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/ARF101500419.