thumb|A glass of Amontillado sherry with olives Sherry ( ) is a fortified wine produced from white grapes grown around the city of Jerez de la Frontera in Andalusia, Spain. Sherry is a drink produced
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 0x5a62f2bf0c556ac41d419f86a91cc57ccf0919029fcf800251f849aab56e2cc7. 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/eae0e6f8-e36f-4c0f-b4cc-4387b0391e56.json and https://artists.proofprofile.net/proofs/artist/eae0e6f8-e36f-4c0f-b4cc-4387b0391e56.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 0xd7ea0ecad0229709bfd1cb35cb3d2345c0bf337fe22e1788ab8f6fee8abff41e. 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/ZZOPM2115640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f2cf9bdd6afed0238b7d35947f7f9521b6ebe7bd66aa698fb386dffdda1a75. 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/ZZOPM2235526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca7bc5e88f909e4df4f37c1827771e4bd7777c6c6e99775e56713fa2c01bf98. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SGB502259848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d01357c87526fb82a43a58f5562d4671b7ac6e9aec686880277f5521743495. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GXBAV2307845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80b46b6d77b41422ff2c3ee2fe2a9da6a80a21386b2ccf828d715101626e83b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GXBAV2358542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd59b3162618e3d4f7d1831602e8ef7d28b1e67df8aadd70229d8866a4d0b4c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GXBAV2471525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd4afa830e85c0bf8e26eda2554a4614c1cc80ceb78bc6b95b71cf6f363696b. 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/GXD7G2499850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d4db4d3116bae7fb8aefcb68801afc8eb0c25f880be3990772d16e307ed803. 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/AEA3A2359937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f5164073f89571f6b6b46b56e27517550c18936dedeaeb6792739be40ed853. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AEA3A2367810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cba1c2fe52fc2b07b03253110d9ecb4ca98aee65ec7f1f610e38e4257d52396. 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/SGW502284181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6f6fa72aab968580e46bbcb6290b44d8ed5a014eeae20b703000ef9316f599. 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/QM4TW2320716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83e45683fc2d922366cc402822fe2882cf69fa0cb4dcb8e6e804a9255bd8bae. 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/USL4Q2482709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58aebd6586f2072c4e54748dfa92e71048548570ff170fdffb4a421d5aa52eea. 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/SGW502370287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a235d3dd3ce714e7285ea73d5a8556c3c5a6dcd92ebe1c9106e20942fd92dc. 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/MXF152301240.