Zeta (, ; uppercase Ζ, lowercase ζ; (Ancient Greek and Katharevousa: ζῆτα, , classical or zē̂ta; zíta) is the sixth letter of the Greek alphabet. In the system of Greek numerals, it has a value 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5320b4cd00902176c8a92934e8fc149e3edb3786d08d800402670dec536ec92a. 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/d30c8f23-d647-4e5f-9998-516df8fdc935.json and https://artists.proofprofile.net/proofs/artist/d30c8f23-d647-4e5f-9998-516df8fdc935.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 0x49bcc244dca629cafec1cabd747a5104383c33b699ff1927e7f655fe6f758419. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM2PV1548311.
¿Por qué cargamos el peso de la melancolía del mundo entero sobre nosotros?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d7ea47c5c79326aa00cdcefbb8d3b729655b6fd211cc90d1280a04715f2ac0. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:21:16Z), 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/QM4DW1695752.
¿Por qué sentimos la necesidad de romper con todo?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5c1270a8a512181a119c76bb122775e503e5be91982db54ee288a001dc1236. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QM4DW1695753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1798bdd248cde9eb4a63aba98963065e7f5a11abdb1aa3114bb4b1fce81c890. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES61823977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03a2e62d66bdc27f3efb740b4a1464a97b2cbcc40a35f7501980ea594a1d5a8. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GBRKQ2140514.
Zeta in Austin, TX July 26 (Live At Parish 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5fa5ef78a9424e4c761c6f76a80e9f34b5fcf72e563577c3a0a7796a5e80bd. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T14:48:20Z), 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/GBRKQ2473964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f205f79fb965537cc6255ee5b9afe6fc247132251d049e0b3dbd736d5641f6f. 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/GBRKQ2473857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf122ce597f97c32d4e63daadbb395343fd24f50cd7b625a0cdc80359b94c7753. 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/QZWV32384438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab25cfe37ffc56fa3764ff9bb794c6a4dcc3b74c68e05c8bbf853934b896277f. 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/QMBZ92483119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fec491c930418e8e5f2a5e9dab41eb1a2743d314c0267c3ffd3669b10d317da. 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/QMBZ92474635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab25cfe37ffc56fa3764ff9bb794c6a4dcc3b74c68e05c8bbf853934b896277f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMBZ92483119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0322fa0aa8969bf985d4192db53fe95ca0d2604185c50e52e7584a7c84f16848. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QMBZ92483120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a405c99f1ed97d10135964316ede76f5a63f06b938d0982110bc4542cce7af. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T22:48:23Z), 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/QMBZ92483121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fabadd0c3933d970a110528c53dbb42755ca31f4fffae930eecdd5a62d00d06. 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/QMBZ92485889.
Bring Us The Head Of Francisco False Part 1 : The Day You Realize That You Mean Nothing Is Everything
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50f6890801cd2c26ac271267e0854fe9ddd14a2a1828f5f12731d3ed53a723b. 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/QZDA52499760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf82f5d32aa27b1efe7e0635259db39dc7b1402a7a1c6075a2da552cc6d50589. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM4TX2324335.
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