DNF may refer to: Computing and logic Dutch national flag problem, a computer science–related programming problem proposed by Edsger Dijkstra DNF (software), a package manager for RPM-based Linux d
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 0x766861061330bad9912bbc1dab75c9cd5c7f993794b1a149db2ab7eb19006ada. 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/3d2f8a2c-7642-4626-9ec3-450e9deb3311.json and https://artists.proofprofile.net/proofs/artist/3d2f8a2c-7642-4626-9ec3-450e9deb3311.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 0x3a0c31b5fe68f09db800aad4ded8f96a6359d13fd67984233fddde3b1e63abb0. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/PLN381500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f77500d503783294a8b7d9f94087459ef7b0b8c0cc85d86034ef3479d4f33bc. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/PLN381500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0badd671645b34ad2ee63c6fc2ef9c3cb18777861073865a063a403025328cd. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/PL83A1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1881a16f36175121f052b0e0ee59d6e553941613c1e84b96d00b0c55856af1e8. 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/QZP7F2114409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5f35be6cba675fade9638c314edb731f51f24353fec36c4e62cd33befc1705. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CH7812194719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa492716f572bd44ea080d19e9dfca6fbb562653009bb7910b6e5483b3fa578fa. 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/CH7812198230.
Rude Boy (feat. Mitchy Katawazi & Clarees)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5c1f7b4915758ad21ef9c04a501128e1c527dadcac81dfd7e6de3a504c6f17. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CH7812218033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5cfef3eb1875bb7da32d221ed6e0317ab7d1d5de394c10c0d5a0dd677fb463. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/PL83A2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1e89d49a046121c29fa71dbacac0b608fb5b4a368dd2c9581cf9680a2aeb40. 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/CH7812349230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18245f837cb42edb5aa7278f0cee8e0b7b2a130017f89871e81a8f704c61876e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CH7812349232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a80edb2a4f71dcce8a343a6452ae356851872bc5a10b1dfc616bda8bf4f5202. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CH7812364466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae48b35c8b0a014295a6f8e601ce1f62071cabb8ffb1e8285d4d8538c40ac26b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/CH7812534884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1a49b7e97d48849de959484ca8963d5c12f8b72cc18548c8c00fa5296e99a5. 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/NLZ542101792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f8e0c61aba527e93f5166aec7dee39a59a021ad58618abe536111fb615c414. 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/CH4882200201.
Kontor Sports 2022.09 - 130 BPM Workout Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee9c59c079265120f526dec4a2c4d4967ac209931471ef44e606a60cdfc24b7. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/DEN062201171.