DZ, Dz, or dz may refer to: Businesses and organizations DarkZero Esports, an American esports organization Delftsche Zwervers, a Dutch student society and rover crew Delta Zeta, a college sorority i
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 0x44949875c0444d1efd044894d4b2eb46b1de8a3da66c81e5ab07557aafa7e26d. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dbfd2736-6f27-49d8-91a9-bd00655fd43e.json and https://artists.proofprofile.net/proofs/artist/dbfd2736-6f27-49d8-91a9-bd00655fd43e.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 0x9fa31b41750974751cea3b378542980552001cd50c4b2727e195a45ed0286ecf. 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/QMFME2199485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab14fe460b7c65e5c94b439bafa9a877532bc3e14591c52b9a3d6ee1acb64a76. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QMFME2086500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d28722256bf25c85d14e88395b031a06aa6f38ea0aefbced6025198c60526fa. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:23:11Z), 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/GBLFP2424498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa43e37a5bd3c6b674e65bcead309a7e0d513cdfebcd4a77db365117c7f9f48e. 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/QMBZ92007456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f43e375f9a966bd552f75defbe37d64974052733e051040062a423f55f797b2. 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/USA2P2207258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5d81a61dac4b08fd575bb92a5cfe4919d43e95c063f7d941f477c756240def. 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/TCAFO2104298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe121815328d7db02621df59076c937363e08f843815bb87f2746f2465ff631. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ZAA020600556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d0041492fa4ffd96ab3a47dd791bd31b0a92d77edf52167b03121fef3736fd. 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/ZAA020600558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafba3a51f3e2ee8a6a90b0271d5e5c69b216cd0d6a2e50842d6c3fed7ddc5887. 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/ZAA020600559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cad52b80c35962059d3ce67938cf30b6261d5a320fb46545dcc3c75713b3b2. 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/ZAA020600560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abd63e7b63d343ca7899171510b5770f94342df9c47afd4e726d10e1ab3f4ee. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ZAA020600562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb727990a4dcdcf6fbf361f42e34f660dcd9337f9fbd048a0227c9031d0812852. 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/ZAA020600565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fe4c500be520697453084925a61f8ba0a77e6bc26bdd77095857e202c992d9. 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/ZAA020600574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c4aa3f2bfe1ebcc3746824639f1d759c70a55e44b7e8a276920f09d84ce0cf. 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/ZAA020600576.