Czarface (; often stylized in all caps) is an American hip-hop supergroup formed in 2013 by underground hip-hop duo 7L & Esoteric and Wu-Tang Clan member Inspectah Deck. They released their acclaimed
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 0xfdde17c83805905fbfa74aaa2adb8b2e8a91efc14f8a16ea670da3fb87b97ba1. 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/1de913ac-c8b7-4f94-a530-8c0ee9bd8415.json and https://artists.proofprofile.net/proofs/artist/1de913ac-c8b7-4f94-a530-8c0ee9bd8415.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 0x951d581159161c89b5c314192d38b69c55a89b9eec7abacc50bd543bed0069a6. 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/QMRSZ2001387.
Damage Control - The Timbuk​-​Uatu Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6019c048884ee5b12ddc601af9041b1095a1761cebdbe13c7d843123f9072362. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CA7I82200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd208ed1b89c07cacd51f069d5995730c73d7ad668367ce6821d10eeb379acb. 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/USFZH1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e4c8ef7da645d66170bbfe009d0112a20cfd2b769ee9b59b23bb15aa15c778. 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/USFZH1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9e6243f570601be9ce6419ddd87801376fd71290a0bc2397200413c8178d11. 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/USFZH1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b914e2565a39f79808a529934c6f1a6f9474f0fc238b800e89c43227172929. 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/USFZH1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ec3ab4f5abb7da28365704e551e074d4c942ba579f7ea16b3c0257dc86fdbd. 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/USFZH1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4435984ad5c4c4499f94e2cfe449c3feee59602868d6d0f22f4a8c56a6523fe. 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/USFZH1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e10a290485df07bd7cdfaf2c63a85f930e8604dedea9a01987a2645a3d0212. 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/USFZH1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68f9d74ea6a8eea2bd094c591f8e54edcd878e62d6c97545382f3adaee04efa. 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/USFZH1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ee3a688c50786a6a9c6a367d11356b69144638a9d3ca8b2adcaab693e1ea01. 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/USFZH1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd03fd0a7893a9bedf44672f0ef513707dcc687495bddacfc0e8e4545d45379. 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/USFZH1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b65d4ef763349755cc048f3675ce900db6f0bee26703b01733119d6fc75d47. 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/USFZH1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85118ea7cfba80e184e31f1c4ca15ffa7a2ba59cfb67efb2f0b4aa0bd8bd81f. 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/USFZH1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e925b50eac7d20e86e61f220bfb6ed308131ee3f506d32b7a55a02bddd9cca6. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZMER2198441.
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 0xf2215a4f15e7e9642eaf6ab6602013837e91bb79194b5fe58db5b214b5b79db2. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMFMF1584988.