Charles Williamson (born 1977), better known by his stage name Guerilla Black, is an American rapper from Compton, California.Guerilla Black, Imdb.com, accessed April 20, 2010. Born in Chicago, Illin
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 0xfb052ca6b29d942dee294da0f79776525e2614ad2f0e2c6343a3641c7ed61a85. 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/92e38d66-0a36-47c6-911f-9d788a85897f.json and https://artists.proofprofile.net/proofs/artist/92e38d66-0a36-47c6-911f-9d788a85897f.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 0xa929a24158d4630f665af0e2d1a7dae606a767a207ff614372f410fd71716161. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USVI20400316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9428c6c129e5d79d2cdc3b1b639299eb3f42f86f65c21f068321047722b0edc5. 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/USVI20400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26106e745144717e46548aafab7f960298fda10cdb8571d4a9dbc88c10166aa. 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/USVI20301289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac724894be5fc58066b59f46b8fe64901ff0d0afa40dea25e71e8da5a9c135db. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USVI20400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd640edea71ef143dfabf5f355cc66a805b61f21e45f54c68f401137d1c6bcf48. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USVI20301288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32e1049ecce5c396abb2ae98d7f4a267fd1867cf4349bb57da4982f39df2084. 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/USVI20400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3d4462a3c8773ee33c9f10b0134574e62bdeba618e5d75507445fea24af415. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USVI20400323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38846dcb8ddbd913b909dc1a2622f5ae5e29c2cb23d7741b737b16fcf03352fd. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/USVI20400324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4d191fdde4bb03f3c2f00b2047570e1cbf9137eae48f085fce4b71534bd926. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CA5KR1979421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a5af508a1782fd0d3f440434c4b35b5766153f4b6176fc5009e9bc2faeb3ca. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/CA5KR1979423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44211769bfb29080e541fe6882e8019045e9623cad212216bb42e27d9b387229. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/CA5KR1979429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37fcdb2128c0bd5f99efa060b3af293820b035b93a00faf4181d24d79225813. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA5KR1979438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9481a96070ceeefaa535db297ea82da036ad41c470b5792af6bbed831fea2f3c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CA5KR1979440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841589f5a3d8ce00b9756d08373cb6004c1c5bf511bdb13dd86e20bc78f85a64. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USJCH0710597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b41ae71f58ddd3c69acb94f090f3fc97f347b3d48f36ab98f10be73ed56093a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCAFN2123718.