thumb|Tránsito Cocomarola Mario del Tránsito Cocomarola (San Cosme, Corrientes, 15 August 1918 – 19 September 1974) was an Argentine musician and folklorist, and is known as one of the most influenti
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 0x1b527e7d2ec27cb2888c0e3ce13481dae5372787c5964f51d31a549af69473c9. 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/7d335a35-0c33-4db3-8796-b07036d3939d.json and https://artists.proofprofile.net/proofs/artist/7d335a35-0c33-4db3-8796-b07036d3939d.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 0x251f01158803780669bcf2866d0b56d4236d84605e3c49a77c2160c01cbde094. 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/ARG991045293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bf62ed9f299cbc71f419db175a6b205145d4893a8afc41bc153b150f07efee. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ARF096300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee00d1ae9bd3ad5dd858a8ed8a3da3738c2cbb8b60fce341f4c2dee078406607. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/ARF097500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9196e67515e63ac2f61ff3020de4ec9ac04feb3021372394e2f70d3d117b4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARUM70800704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a69b37fddeeeffec5abc7865f22ec8836212902c6ca4b17b6459692f9a6171. 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/ARF097400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d144b3c8291968475981bef809c3bcd734184d307d39b520caa74fd9d6822b2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARUM70800706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc0716d38cd80b4d42a813123e8b66113d26e287266a7e180c44ebdf053a2cd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ARUM70800707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5afa034c5247fa1990d623fe92afff8ee7c19ff1f6de165f157f8aa0f0302a. 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/ARF096600213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3863612e3e9d875d9847b160b0c5ca3125abb768eb051f0d5442e3b827251c65. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ESA031316872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6919f9961b5cdc9cce96cd8826aa061db93609270db74ba4a00de89aef71983c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ESA031316877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4728675356d7ef79fa2958a1153d0e71eba2fd6f20b96e59c5e0467eef71bac7. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ESA031316883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad5cadf935b69ff2bca0278244c108e5a4bdf386f15bc7d54526ce3e9a2100f. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/AR8L71301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9f8cc5ade8ff78ddd2317f4aed4ff364b42d190ac3aa41e10510da0c861436. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ARHXW2102591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795c015c6eba333ea3dfa868b9f2bd975149d202172081eb674d169b760c54a5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ARHXW2102592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501d3c624d5dcd2a0c0e01820eee59c5a7452848e4c948971073cdf2ab3dab48. 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/ARHXW2102597.
Archivo Histórico, Vol. 12 (Remastered 2025)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48501b1c952044e4342a83644aa09725121680c3e7b26c0f3275edeaf6ddf974. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ART721510001.