Tute () is a trick-taking card game of the ace–ten family for two to four players. Originating in Italy, where it was known as tutti, during the 19th century the game spread in Spain, becoming one of
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 0x563a2d306c6c10f05809b6cf2873fe594110a71b4281a8ef084796d5e97dd5cb. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/067ee114-8a9e-4031-a73a-c15d10f90851.json and https://artists.proofprofile.net/proofs/artist/067ee114-8a9e-4031-a73a-c15d10f90851.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 0xbeece5864027753af1a12d71a4b228a2ff659498c98f9818ce2ff670eeecb386. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ARF051800128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e4fc7c92179bbd79e1740c8c39f6243a6aadfb5ed04f7f676ae44cdf8b5a11. 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/ARF051800120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe558dd8d2cb5df451b7d438d40f40c886571c13090fec421b47e0be5f7601374. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/ARF051800121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1955f92a07530efe6cb42ba8ba217d05860ff6d0ff43620e793cadb56c9e7fb5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ARF051800122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce652a67a94b8ff5903a3426d544dc4d495afc427e7ed3a10ed8b70a2eb3d71f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ARF051800129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87dc1388ca076f3f3dedcb8ac17c824cc3a234e28b9638b22ee11d919484caf. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ARF051800123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca7886efa7608bda0bf2e5627a23871097d223aedc546cf5080b145314ec0af. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/ARF051800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6473c84fb61023794bc5e99c1d35eae5cd416a670d932d8043b08ea110a50d1d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ARF051800125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c95c1cb3d8d8247d9d6acca1102a6cc30874378a6ee636ad178905453f369ca. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ARF051800126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24cd5b5325735161e21cf63aaab358da42a5bb5f973c64abf0c7133da479ac9. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/ARF051800127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c04d7478da060fcd902d0df6a373d77d46652f207b8816b0b9637b5dd942300. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ARHXW2002507.