TZ or tz may refer to: Media The Twilight Zone, an American television anthology series Terezi Pyrope, a character from the webcomic Homestuck, frequently called "TZ" by her friend Sollux. Tz (n
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 0x553314e545a36e0d1ea3f2adfdb977d4bb946663a01b7e3a6dddfda51c9f4c52. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89e2fb09-b2e6-4187-8b3a-b36bd434e01a.json and https://artists.proofprofile.net/proofs/artist/89e2fb09-b2e6-4187-8b3a-b36bd434e01a.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 0x627e932e578b89a1e4a2c2e05b6cd98e70de56c8a8c73a569aab357fb3d22040. 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/NLRD52413837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576963880253bc3cf473bed32faca7d18442c8db129307559ad26e1af9b170ca. 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/NLRD52413809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01168050ffe31cc96c166c548286cd3c123bb8f748731605253123de6641981a. 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/NLRD52355179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6b0f32302cc6b0341dae8981a548d843f60726b85ce979c611a00b2cf955aa. 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/NLRD52355137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2add2a61e4501863033c3042030b86082f1b4331544b0daad3156949dd3c5bad. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:59:22Z), 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/NLRD52413813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee17b10fe84fb2834af7b2547bbd69769118bfc53fdc8e3dceabae9796db1f0. 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/NLCK42221217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc065ea0edc11087005c44637e2803c885dd13bb80e92737dbea04cf9e11d2. 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/NLCK42220415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054679ea344ba64bd1dd00709ba9bf4c77ba44e91e206867f863e62d3916ff67. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLCK42221221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5733746a7d3be12cfc958e1afa03b6c6cf959b09b25c61761f59fc539fdbed44. 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/NLCK42217535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e11aeaa4f750506376fdf30b6523279fe66a88599b923377eab61ef3587a94. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBIGR2269006.