Andrew Robert Nielsen (born October 6, 1982), known professionally as MC Lars, is an American rapper, producer, educator, and founder of Horris Records. A graduate of Stanford University and the Unive
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 0x5cc0c991fe434b5359d677a1fe9ff68f158ba65e615fcb2bf72e1a36b9862d80. 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/5bc4c3f4-0649-4111-9e25-2193c8457c9f.json and https://artists.proofprofile.net/proofs/artist/5bc4c3f4-0649-4111-9e25-2193c8457c9f.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 0x9110be8e4d38ebecb4b4a51318a2ae88f6f6059b05b85e71e13775726b630684. 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/USTC00997443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27919d91f3a729cf49ae2e350c73f188b1a5bac81a50680fe35b4b38b265116b. 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/USTC00997446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b9bcff4df01a6f41f90db9a42d05674bc90535a3e90251e70a34af1fb618e4. 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/USTC00997500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3774c5516ec7ae5981a78a5c4678855d143bee83094322b86a266b47af7437. 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/USTC00997507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ece5664e539822954cafa9d868dff9e8ba0a7f595ec6a57901f9034f2f220a. 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/USTC00997538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd413b69c785eb1bfb7fa13c60449bbcc4283f1163858bb0891558940fe23f0. 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/USTC00997546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaaf4467188d044a03f1d6c3f81ac2577deb46551259186cc1ea6b115ab3746e. 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/USTC00997566.
The FuMP, Vol. 83: September - October 2020
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b0a67d770b8e796bfdf4d63ab9d0de03c42e0132e5ea4d916daa5afe80b425. 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/USJ3V2030447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afb08d5b9b817e5c215470879eb5402e540f4a1faf2d38ee802d2578e3cd66f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USTCD1057872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56355fddd85e4f9b443ac3e03028408b69757a8004dd55a5dc177d7f3f1142a4. 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/USTCD1057873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b4d0cf0868b7ecd846329481e98708675d76d5dfafafef478b359fa1c28997. 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/USTCD1057874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cb2bee5e39beb0c778b4f7b669647abcd8a85a4a88a042d592ed77f22f33d1. 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/USTCD1057876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5948a920d678350570d702d6f9168b55e4f05ee4b64580d8a8b59780603855e. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USTCD1057880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b06c18d66e65e363fd3c164c798b55725077e2739de36fb738ed96e0a49d3ad. 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/USTCD1057881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a4ccc435cf17a17040f0655e07a74a660dc49b2b1ce40d565fefdc7d00d334. 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/USTCD1057882.