GZ or gz may refer to: .gz, the file extension for gzip files (GNU zip, an open source file compression program) GZ, an HCPCS Level II modifier meaning an item or service is expected to be denied a
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 0x60ebefe21d2e8845c6c6ce4b1f2556d416c3f013e11aefc1231324c9a110123f. 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/84476300-ef3b-4d5a-be19-daa7c9ceaa63.json and https://artists.proofprofile.net/proofs/artist/84476300-ef3b-4d5a-be19-daa7c9ceaa63.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 0x65851ee6e3a83b70588f6d2aa6a6f9eab9c7e9220d78b355be00809768c480d1. 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/QZTBA2596453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7eedb6c10bfa10b7d50101e7406422b7cdce8483c050432d49f3f3f1ddfc61f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZTBA2596414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71ebf2978cf38c8049b6d3e4e1f2b53624314a5ebf4bef0c1dc78eaa641334d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTBA2596405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b4848929bdcad71b2f2cd292d10ecb0e1b5abc22019140cd8afaf592c4aabd. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZTBA2596455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8c9db474d4a6822951489c8654544d2a4c677c7983ec9d6fe78bbdd8ce04a6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTBA2596457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107e113b5bbc3e66e910d5becd060084a1acca98e3e63b6feee6c9f541b34982. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTBB2506696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c90945080f75df67cba4e9efc85e9866e8f811796fb5239218b788eab0380e0. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTBB2500379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36471935373d4f165ea28bd5fe39f90c39e6dd6b267290e791c0180f4095809. 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/QZTBA2598723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bbd1d77033192960848e48a87d3ab102bda41ea6e4dd4c15e267f2ec69e7e6. 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/QZTBE2512712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e07ddecda1ec085247218c6d63a62b26d77789674fba4c8ce95f2e5d124d3cc. 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/QZWFF2586272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d7666ffc397fdd89c015f1c96ac088d66683d515277491855027a4292c1c18. 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/QZWFK2507731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bbd1d77033192960848e48a87d3ab102bda41ea6e4dd4c15e267f2ec69e7e6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTBE2512712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d8a88b6dfee97ca447d35b3b9cc9f463b6695926c624a6ca437cd6c5e268a7. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZWFK2507734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b4e854e6a20caf4821789acaccc2e7066bce86f8e0bebf8008911e917af38c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFK2507735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8365c635db6dbb763ccb3ed4a534c4b32d3dbb21bf48c78885286a331701ed. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZWFK2507736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da28f37f71a3381129b6d6ff57266c1b63752ba136c547e7a62f5bdc4409a89. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZWFK2507737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b8bf4311706b92897fc7fbf0b4af7e8cf01f8bf72f2c3bb6de022604646c55. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFK2507738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6c04b581d3ae29c266c5bf208c9509bdd7f7e0b25b717d585e9835e66e4dc8. 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/QZWFK2507739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c32a0e77719aca05fcb18a86439faeb0493685b2d02d63901de32a340610ec. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFP2523946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d19f6116b666d685f975444375f5e77283f5edaa9687b68db67f97d816c235. 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/QZWFR2508526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e32d514fef0512be6faed884ce9d52bad74dbdc4166c381070d54c72d647627. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFR2508498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40fd2dd4461af69ad4f82285779f1810a4e18df1372dbc723b2dc1d9bbf47de. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFU2594688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc3cf753463ebdbc45bf884461b18a1b53fd84e30a90120b4d7d6e0e8a85f4b. 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/QZZ7T2518994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2940b8f0c62780b7a4f3bc0d864af54502ca1b93b5874dd90296ce66b295239b. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ7W2559717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1f50230ef182af3174f7ef530d73fe11e6d3f2e58da83574fbc1961ad38a54. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZZ7W2559718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762abfea857982dc2ef6eaa4228e12d49eb377a358eb0013b23d22bc46588f45. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7W2559719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14068eb6e35ced5d0dc728fc67d802ab79c8b82410061963b2e79bfbf65bd9fe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7W2559720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00715e29d5950a54764552d5649003c904eae4eed88293d4da7e612e577fe2d. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZZ7W2559721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d20a29c7643dafcd7e23a1cc050ccb115a44d8e661a417382620b8998847a4. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZZ7W2559722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59317e68c616c81dfd43c7d60e710b1bd240c862f2d2d57a7549bee5c60e81d. 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/QZZ7W2559723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a70efd5b894f96f42388a4afe87e8d7055aee9c0ed11645d6dcedddfda01473. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7W2559725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a80e4360199e6c9e27535bc1a24465cddbf190594da0ee89d735b217aaaf77. 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/QT3EY2586459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340433fecb298d07f5324762a3bb4280e2f9b1b377135d5c8c5a1ca3a7607dd4. 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/QT3FF2500256.