Sisa may refer to: SISA, Società Italiana Servizi Aerei, Italian airline and flight training school associated with Cantieri Aeronautici e Navali Triestini (C.R.D.A Canterei), later merged with other
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 0xc607d68dd131549d0787af80b63e331950b92fca1b429cbb56943e8310fa667b. 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/869ee3b3-c0dd-4143-b686-b91b0ea31d98.json and https://artists.proofprofile.net/proofs/artist/869ee3b3-c0dd-4143-b686-b91b0ea31d98.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 0xb80b60eb29ec213954b9e21c2bf9a15e9cecc103ebab6fa270f7090efe5b3070. 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/ES6100618201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94617ad42db5cdfebf05514a35d44c83704bd418f08c6aaf4d0a9e156ca066f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ES6100618203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246e71e3fbcbd88ca8ceffa31d5ada153b9a51929b96e58464df39e03776e746. 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/ES6100618204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645d4a722f40c1d9beff986f145e44964b74c21c7dc6d25f0827f96ab7af206c. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/ES6100618206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d94880f7b903ebec9d4ba893e165d436d889860ca54c23614c1c42c86ae3cb4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES6100617501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1114731497207028fdf3b4666b7a0f586673fc6b55b09a67c64b8323caec4b. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ES6100617504.
El Viajante (Sisa Mestres Llamado Solfa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab894e40b23e7d05b6835a89d62f2c50e55569b7473a77fb660a45397349e6f. 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/ESA031431558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d1463a00e20cc5d3071a638281119a21446ca9502cea4e78f3966a1ffffd99. 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/ESA031431564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06c90155a580fa83a22f37da189864d2df8fb820d829422697d1d99bc985b9f. 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/ES6101320406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074bc3be4b06e914aa39420b4f14c79cf9d054bee1140ce49f4c5810144e9072. 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/ES14E1900012.