DTF may refer to: Arts and entertainment DTF (rap duo), French duo "D T F", a song by Adore Delano from the 2014 album Till Death Do Us Party Technology Digital Tape Format, for magnetic tape sto
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 0x282de0387cca500158a08c6b4c1c4e6ff54848f80efdc6ac489f19a42416fa13. 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/892da0e7-cddc-4730-91fc-b359f39452de.json and https://artists.proofprofile.net/proofs/artist/892da0e7-cddc-4730-91fc-b359f39452de.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 0x3141955f05ebf77b703dc4e8f2210c5904a4db2ee72ef0a65276f7be86faacfa. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/FR0U91600221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a440e501623f75caeebd393d27743dcefc44300e428fd55f54272eea526759. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR0U91600209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eb1bf83274250d96033feb3c3e061872a60b645a84c8f2ebb46d3ddc6ce050. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR0U91600212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa773121a134a6aa6164af15ae1ddf2c6ba69f9709794ea106d509d64713555a4. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/FR0U91601026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f33279e9063de71b5a88eb302a5f96b72e0e4a76e2b09c5d6f4596fc321ebc5. 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/FR0U91601207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5594e6961ff46cb7f4366d4d17b60a6bac1096c2b87c59cc46c7ed394ad2114. 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/FR0U91601568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fc11ee64a9624ba9c6749b1197e5f8e500d6ba7066e4502675068b046a5b5c. 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/FR0U91700425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf466ff9c35b26b6b415cac0c64395be7fc64b709aced445bde75f3b49d74ddd9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T04:58:53Z), 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/FR0U91800625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76282a4e3c8db53002a5d3d051c2d4bd1ca1235135abb69a760d519f4d90a436. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FR8JU1900310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2418cd6cd99905bd0079a5c589fec9bb6b4cc7971becb62adb5849fa3fea89ac. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9931349b2b81fd9b306eddc43b6fe3f57d74928af24351400b9d148b22ef158a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c702dacb38f3e47d3d68e909ac5b16549f53d8a7dbc265652469c64e2360f81. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfe82dea60c1d263b19839971be01474efedbda02c276b33b2a53f2a4624f8f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4183c41ea7c7c55ea0353608220eded0b6ea2d38198a8850596860d30141d6d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d780a3b7fec905b6dd3667dedef9d130d02b0605be65de716404f397f1bc81. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR8JU2200140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c70f20d4df7885abba2b8358003b7428552f1f3fb4f895e91a407680df21513. 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/FR8JU2200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9a8072d62696bbb5e39c7655099fb44841a4abdd840a53700e13a79cb5b3f5. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/FR8JU2200160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560ec42bc5fd33e21a59c2d15a48cd4e4bd13eea708edd629467c107b51af5ad. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/DGA072502678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12db5000d890b2404561b1123c514b433f409d3f66fa95c91b10426db798b808. 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/FR9W12366388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12db5000d890b2404561b1123c514b433f409d3f66fa95c91b10426db798b808. 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/FR9W12366388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a0c13f5ee4e4fbc69473149b9f7d4db164781794f322b4ed19f3411b1a8f8e. 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/FR9W11711090.