Darwin Turner, better known by his stage name Choppa, is an American rapper and singer. History His first album Choppa Style was released in 2001 by independent label Take Fo' Records. The eponymous
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 0x0d421e754c0dbcbf61a1b21fb1e00501e6779b15b3f3ef51f7be5cdb3985e2f9. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42fa561a-7bcf-4f7a-973c-61c2c147640a.json and https://artists.proofprofile.net/proofs/artist/42fa561a-7bcf-4f7a-973c-61c2c147640a.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 0xcd4d01423aee4c2e45c256bceec2ee72f0903f98150d2474f4089d4bb9a2bcbc. 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/NLS242200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c3b85df2f6e2728e9441a245110bd5ea1e92cc295190870de1e349eb855700. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLS242200087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bbf36ecb711563684833741a1030a79010bf197db642ebe5b5ff2fd9e05f41. 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/QZFZ42016648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3358bf9a6d046a091fa6b04df46d662e0d795e789a508ce8c4c834724e9b292. 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/TCAFJ2142337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c32854df6afdab13c213f4fe766a0512936ea30557b37196cbde913292de3d. 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/TCAFJ2142407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1b30c60b383214a6d44ad1bbad52e27057aac235dfafabf1701b4ba81e5fe3. 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/TCAFJ2142416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c762ec80b8b7c796d5810d9612c47d63b724cddbad0b5e95b6551d6c572809. 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/TCAFJ2142506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4709a3a873d8a04f39165ab83fa7be3ffbcb6a00f39cb9e72c968c6834443c6. 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/TCAFJ2142512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11dcdfea33b73a08537503050be9892c73918a686f6a56c7b737380ea3bedb1. 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/TCAFJ2142530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19c9bb2312b03d85c58d40c2547e2ffd34986caa23bc41012a2bbb892705767. 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/TCAFJ2142569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa590fa1ef78321acba8a3db4f15aa5989b194ef3c821d4309c9c2fb9795ecba4. 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/TCAFJ2142574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168015eec6b0b1e174a0335b8b7442827250659fa6029772737c465ca55aee5e. 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/QZK6H2266517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7f9e0cff5e8cb0dd8c057a7d9c1e8e3771b42efa15a01a0134d3fbae52a46f. 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/QZDA82205097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbb0e6e7e307723623d1d2f7f9160c490ef6fe878107e3ab19bdccc8d72348e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAIZ2491621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbb0e6e7e307723623d1d2f7f9160c490ef6fe878107e3ab19bdccc8d72348e. 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/TCAIZ2491621.