thumb|215px|Facón in an elaborate sheath A facón is a fighting and utility knife widely used in Argentina, Brazil, and Uruguay as the principal tool and weapon of the gaucho of the South American pamp
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebadb7b94eaaae25822e703e669ee387486704a6d1e418342b7337a44027f35. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b782ac1-05f9-4bcd-9a61-f99ab9325b7c.json and https://artists.proofprofile.net/proofs/artist/9b782ac1-05f9-4bcd-9a61-f99ab9325b7c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336cd6b039ddd4228cb4fdc188591652de1f8198deba6494c52c878142d7c7e0. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZGLS2409518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537d3ae605b888416522e8936e182565396eff148d948c4c470f6872b0b1e4bc. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZGLS2409520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3b5fdaaf7825676e650a01b72347a1b3f8693286b534e0e98e717ea2c07b1d. 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/QZGLS2409521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f69b54a2f93ebeb8ed4f3a24f8d2b936f74231562db6b73f6a1611b5b5f5f1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZGLS2409524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d375eea44762698c8d0aa2a7952121fb2993845af67b0ad69e7145efa292bd4. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZGLS2409526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab2d2394dff7aca0619dc02d15bcecfb1969c92710d54e488b179b69a2b8c18. 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/QZGLS2420972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc359449b755d687f2e39a8acf2ae20451fdd8b19c796512b913ccf32ea1e460. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZGLS2419639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc509a842dacf530efcb79359af3863d561e5de057ac88377cbf54deb7e479b0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:34:03Z), 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/QZGLS2419651.
En el Teatro Municipal de Olavarría (En Vivo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d0876bd2e957a2ffde309999f833ce8f78cf00342a352a0820f419f44d49b5. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:20:39Z), 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/QZGLS2517391.