F9, F09, F.IX, F 9 or F-9 may refer to: Transport and vehicles EMD F9, a locomotive in the 1950s F-9 Flying Fortress, a variant of the B-17 Flying Fortress F9C Sparrowhawk, a biplane parasite figh
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 0xa3b58d9dd5e460b1a57f65128f1ca9c1bb4e422de629e925353a5637bcc3ad67. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b6f3416-1990-4689-9d36-082b93e734da.json and https://artists.proofprofile.net/proofs/artist/4b6f3416-1990-4689-9d36-082b93e734da.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 0x0a7e0b28f05e28d6d8314015a8fe9bef1e7db6209c4efbafdc0e1597e138515c. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEA812000213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c8541329520052c9059cab0d6f3eaff7b525b7db73e7d219eae9a4cd7a569f. 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/GBARL1800523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3234bbae64a99b4efc21e42d17be0b5b143bec5111fb3765bcdda4b5d11356fa. 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/GB5KW2003349.
Sora ni kakaru kiminokoe. (feat. nameless, Nano, Lon, Kobato, F9 & Nozomu)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e19c4e7a3ff0f435773dec0c0dd2534b0844fae128336749469cab6a8394f53. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCJPM2059927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334fb08b2849fed8bf231072207c11bba6243fcb89fe0ba07a2e8581156c8d56. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/JPW561902233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc5b53dd63f1274fad28a006d8253e5bc5fcf8587546f75e48a131d7b3c7c8d. 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/TCJPK2061584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ed8d9737f8757178c81e13f6d8b95bf263300ef292f7b4245791bfc414eda4. 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/TCJPK2061588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517a89de0c78fee83f9bf1c9ac37f63d630b380b1d64aef0d001ad5cb008c208. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/UKPL51800023.
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 0x0944dd2651c147a626285cb84d83171abf07f73a6d7f9fcf4fb08dc610bed066. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UKPL51800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950b1a4e0ee0849ef1be7adca5cbf34b17cca1472062fa8f439d7838d55a38c8. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/UKL7K1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45699a1dcb252a4ffb52bdb34dab3cd03cc76909bfaf844c6d2dcf1f81f0638c. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/SEVGT1900093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88cb13b370c0f32ce408a2563c91ccfeb48584ebdc126686d57e65c4f094d96. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/JPW561902179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f350760cf7cf9c5347da7baa6025f941c37ed40b4ae16d3ff3eca25c5cd2c5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/JPW561902184.