CEZ stands for: one of Falconbridge Ltd.'s refineries a Czech news channel IATA airport code for Cortez Municipal Airport CEZ Group, a Czech energy company The Chernobyl Exclusion Zone
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 0x408a92eaa9c6912e26de69cc127eb05fd20ed3f6a4391050dbbbfd2f1bd86d04. 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/c21d8043-3699-4018-9a36-f9b749c4fba0.json and https://artists.proofprofile.net/proofs/artist/c21d8043-3699-4018-9a36-f9b749c4fba0.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 0xc4ddb71f009991ff1de84c79cad0167711a20014892ea7d158dfd16077fd6c52. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNWV2205049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ddb71f009991ff1de84c79cad0167711a20014892ea7d158dfd16077fd6c52. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWV2205049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515a56579bb1c58cce9554b4b393465b919682fd9bf69a17ce4821b296328f61. 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/QZTBA2252945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd798e6a3d9588153f52e6caff60bdebf70b34ede246684765497799f8e42d19d. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZTBB2352999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad04fa99b759ea7cf7a2894ecaaea8b8f994bb66a9e60a0aa0ab54f8cf60196c. 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/QZWFP2348878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5d1d1cb928956041cc17d46a043934fd7afbd6b7172d9b09e35a1de0381ffa. 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/QZDA72434281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854821f8906615e6fd352f37b6042612ed7c770e5cb69079486aa4a7c8e31a75. 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/QZK6H2452510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b785a1af4d1e8881fbfaea60e1ce8a2475ccf5b1b4d797b20d637b66b8b3da1. 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/QZZ7W2480719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2235dadfff04039ada971e9c448a48b6b196e171b018250a65728bc34c30209. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7W2480720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb40c34e525cc337279f02030bfc3b06231e280aca22c213b37b4609cae2c560. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZZ7W2480721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce81cf1eb049ac94a3618b4da4ad8c22b3ff045cf3bc8dab6bdb6b42a205636. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZZ7W2480722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfade96ef29208b8c8084dfba78b021f77d9179d96d303dd2f2e3f52c45ea53df. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZZ7W2480723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00d9107091aa5f7e7ff6c70d67bdd62ba390b7385f382f3af92e268e51c5622. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZZ7W2480724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9bd06362bf0bb4939e02d81cb37e2bd6b395cb2fef395b8bea45206b0215ec. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7W2480725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f43dabc5fa042d22668538fd29047f1b3553c7d744dce72f7052bb1d3f54bb. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZNWW2502224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870d59a0d07c843207eec663c57d69ee022e7463d69002655550e3564f0fa4bc. 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/QZTAX2542668.