thumb|Cora E. thumb|Cora E. (2000) Cora E. (born Sylvia Macco; 1968 in Kiel, West Germany) is a former nurse turned hip-hop artist who emerged in the early underground German hip hop culture. At the
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 0x7cff82353e229efa361ba424351f4b5e47a0ae8d343b5e8017136be939a5897c. 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/3e48db7c-635d-427d-98cc-b0679a93b3ac.json and https://artists.proofprofile.net/proofs/artist/3e48db7c-635d-427d-98cc-b0679a93b3ac.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 0x9fce8ed51573dd2a3076f2b37845bc6c0869ef01d3596a648e2012e42d340cce. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/DEP952000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff00624b54ed747b3973cde45fbdb225fa91bea5ae73b0341118ebb5ebbe702c. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/DEP952000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670df6b250c740667384188dad045a94ad2e9d874349c4d3478ea09da179fe73. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DEP952000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6424032eeb57b885f1a39e89deafc6ee3b30dca08fa4e21b84e24e24b14664b. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/DEP952000029.
Schlüsselkind 2018 (feat. Cora E. & Rah Digga)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715af3fb7b44210202727c4c4196ec9ce75cfdb6a03c1db30228f832c1fb25d3. 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/DEWC61700050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56feb7f587caf12f64411c1965a5e9702f791ed2e2a350be5235b59ba241f1ec. 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/DETG92400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19cd23b6c2345b7acd9e8b3e272a6e7fbc9e5754e06b25f860cdd5ffc7c606d. 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/FR2X41692246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2eeff9712ec909c1b20d720423b4bc600e72854332902dce3e94d2d7e12799. 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/DEZC62421454.