D12 (an initialism for the Dirty Dozen) is an American hip-hop group from Detroit, Michigan. Formed in 1996, the group achieved mainstream success with its lineup of de facto leader Eminem, Proof, Biz
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 0xfbcc47f8a2e27c97dafa1103c988ba27ad32c64a039552bc3df5cd387cc53996. 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/bf56e20b-04dd-4d68-be4c-79e2eda7ea32.json and https://artists.proofprofile.net/proofs/artist/bf56e20b-04dd-4d68-be4c-79e2eda7ea32.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 0x937bf767f554cfaf35e72017ebaee664b3604ec4e02470564103409e30f32176. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USIR10110382.
The Ultimate Workout Collection: Blood Sweat And Tears
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626958535731f14ffc209ac5c04b0087fc47c9f48d10061a602891414585f0ba. 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/USIR10110482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654ca9ac3b3f200e17d57e3a5da0c15ed3629afcc4d5a5fa450a9c71138060bf. 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/USIR10400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3649e6647b81978c1d1235a0ab728bf773655011225766f4ed2c12c5e1edb6b1. 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/USIR10400124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b15ffbf1d334d0fb07dad04b0aec584aeb44fd338f622ace122cfb4ce7f9e5. 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/USIR10312128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937bf767f554cfaf35e72017ebaee664b3604ec4e02470564103409e30f32176. 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/USIR10110382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bc6e37708536792c6ccaba636141d84a4720d8969f6f143d73871418303254. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USIR10110483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbe0fc45eda8576920279f5fbbd9d62a98a19ad287aff5ac992a7dfca104e54. 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/USIR10211642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654ca9ac3b3f200e17d57e3a5da0c15ed3629afcc4d5a5fa450a9c71138060bf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USIR10400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c36bdf9277b7322255dad42d55c9528a2a9aacf253d6b24af5d09f0591324f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CA5KR1976843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae92c58d72228873b4bc1aa275cb93e3195e7426ee5b7ca16c7511642d1f0d5e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USIR10211065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a980516a73619739aa7d6e9c6f29b233063f2c1d7fd24a555b5faec66d7ef4f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USIR10400817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783f519eda6bccb60958925f38d108e7e8395d7a20305cb86b183ccd8cbda66b. 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/USIR10400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa679b557c8854bfdfa14cd0ea1dced583112ed13e5babdc4adc993cf624592. 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/USIR10400129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf155758d4f3d1e672341488989bd8ca3c673d34b76d4f65742cfaf475a4cc9d1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USIR10400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e9b3053b33e750f11d734cff32fe715f45ff8059ee82d02ddf10ec85e77c35. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USIR10400125.