FZ, F-Z, Fz, or fz may refer to: Arts and entertainment Fold Zandura, an American alternative rock band Forzando, in music, forcingly, with strong emphasis, like an accent Frank Zappa, an American
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 0x534203ed8ef74d7127c85a718b4c1f043019871b2a9e2f92106ee7b4f4e13774. 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/2abee25f-689f-4609-9fe8-f927152460a5.json and https://artists.proofprofile.net/proofs/artist/2abee25f-689f-4609-9fe8-f927152460a5.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 0x7dc4aa80e964b30dd47016e27c0ac50dc5521e9bed4d77c92dd2cfe647305568. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAGF2237828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c53dd92862e3cb6bba0c155938831f8a891b0883d87661168eb89db1f62fd4e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAGF2237835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5ce1b9261717675a4609655825d891d55941be67e5ad631362543e38202194. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGF2237837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc660c75933c9d3e65d937d4a21975856a01bcd6d5998465eecee4bb35f0451. 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/TCAGF2237841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db462d57b550fdeac732a74774eadfc937624f63b1306934b92f7bb69f9c729. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGF2237843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dc92f3287297136e9776dad370bec2b0b0d323d00fc8de0cd9dba89271a4da. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAGF2237844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfb19a9720dbf276213b9bc3a4397c8b86b91556535b66c4d3d8a6075d6aa4a. 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/TCAGF2237848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac61f4b1b13105ad2251cd0314d18dd6731c275d7c6821079224ae220a37f59. 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/TCAGF2237851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c59975f17c156eeb90850f19eabd47260982494827c710bc3104e30c1a8865. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAGF2237853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a46153e72c34a89dbbe792dccbbdd70613098d9b88cc8e297f7004925d73a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGF2237856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b2051eaeed6800df04c89b70a00217bcc5e61605901ace75df3e646fb9fcda. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGF2237858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7256c0f8104b1d5481e0d57078169c27631cb2030807ac025c95c821095571b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAGF2237865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e41000bbd0906505d2d12bf7c53586e586252db9f5fe57ba71642047c7274b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFM2177893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa674ebb525eea920ae0e2d87f3ea3a2a0dbafed7d3e1c33f6b7abf7e55464fa. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAFM2177904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f1cc51849162e693100258a2c248b0f0b273de6e17f1bbad226579b30c735b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAFM2177905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df3b8d67e3fddb895856f2e1caa8abc062fb738c67d16a5eda81f6be46b0986. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFM2177908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153801e83bc5af2bb8846d4cd47b5567261a32e1bf4812525f3375dcb785b023. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAFM2177910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee2becd78dc4c1d1ee548058e9dfc3031a99a07d7aa26c4bd5e307ab53f45bd. 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/TCAFM2177912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4a12a3e8eb0ebd00995c070ec918f254dc7eac21deb72569c655443a5b1258. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFM2177913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b919c1af177762b5b5bbaee819a7646e473417fd69c56c5d3406705b18d540b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEK1939934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd077eb68664c4dc3188d39972fbd319a29e60251c2c652f769354dcb77f7bf6. 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/TCAEK1939935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1116d693d798089258e1e2d790188f3a49336348cb800ae6931c63c85ea6fdd5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEK1939936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbff84c3bd400f08d1463b3ab483939601180cc96bc7df091dfd411cf2ca7d0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEK1939937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd39a7ad0a2e9976309491f01dc9453fedfaa98249504f98823516f38af6339. 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/TCAEK1939939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aab1b2f18a695146d694a9bda340b79e1652d8cb834b32717c8b4ac6f51840. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEK1939941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa709149d2c9ac55f432b12e9b2ecb596dc58743e8da7e92947a257e0c301b906. 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/TCAEK1939942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296544ef67eae0d3ccca0f1520f77bbc93c924a628ef4e848c6f0ee18b77d44a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAEK1939944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765033688e406d5ab4851f369824fb9bea55e5d4ea49ba56899a3f917caa119c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/UKXN22370963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f0cac9bda58566885cd23ab393e3064a49fe9f8f951676995373fdd283df38. 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/UKXN22381879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74264619ec4957dd90610f8801f00c9b19f14eb0888ef1d7feb90d2aeb86bd78. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAHO2304147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22065eed32f7205a8636f103164cde9ce15e53d359882a381e51af17c866bd32. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHO2304307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ccca38ee67c12a20819bcfd907c12efafdbec16382cae77a87d7fc7ae16a31. 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/TCAHO2304408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fab280927cea4b341943aef08ea0f09f1196c9cc3a8e6b5685cb66526b52ae. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAHC2309231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe799bddb0d063fb31ca049e667e9c374d1e62e9669c8748514cce1ce440d723c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TCAGC2275300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8743a9d9b83177a75269bfc5cb3f5b194e701adf38b24a72a096cb1b3316eb. 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/TCAGB2206125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264ab7d1b55163e6383e2d27c65c1b18377916468dc15461cceb1b5f5c67f34f. 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/TCAFJ2117799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c50a697512a82633ec5211863176d9ebbd2444581382a7c692257d7a5adc52c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCADY1838112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58277df2f9b648b3a8608d0bd52e7ba8df2ed0fe0728ce7f9e0ab216b5f66cde. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/UKXN22470079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c9dddac7a55affd6f58c807b9c36c1f0b75594444289b68b14c44bcdf4b95a. 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/TCAIH2414986.