Jason Christopher Medeiros, better known as Mr. J. Medeiros, is an American rapper, record producer, and songwriter. In addition to releasing music under his own name, he is a founding member of 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 0xdf34cb030b6b57f1594babb39607b4e8fdd207c4491b3c432ee25df332c7c04d. 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/78daadd7-2dbb-49c0-b384-395cdc17d66c.json and https://artists.proofprofile.net/proofs/artist/78daadd7-2dbb-49c0-b384-395cdc17d66c.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 0x44be4a7ea3dac05f04ee230eb9d47c69f78869c033ebcd1c638225058dd618bb. 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/USCGJ0960847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41643e0e6e6847809190a8530644d75c95b3ca7ff9d9afce3b3c7737b7a6b35. 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/USCGJ0960848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c775a99d27fdb52223cb42a3955f650b65c2cfb553f27c61770e8ed6f1577f3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USCGJ0960849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25eade3da8e2e29376931af8b3805054dd7dc357eecdcaacfa76ff3fc797623. 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/USCGJ0960850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561bd84325ecb0abc2b90b5b045a5f9618f53eab66123fd2c9995d1357a58688. 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/USCGJ0960851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebfac99e85c96376ef8167f06268872db7af15ead1ff295a67135670fbb735b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USCGJ0960852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e94a25f0b0053032b03e0745b8c66fd6f77d1fedc671cc3b7351403a6cf5be. 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/USCGJ0960853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369a4d50d47ca92f3002b89efe5bef4bf5afd23d746934b229a9a4b99bb05a8e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USCGJ0960854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca5ae27f6cb3bd8229d78e807023eca427dd7b443c0cef2c8a2cb5c0d3289e5. 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/USCGJ0960855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138fb1a5953ebd860f6b0afc091e446c27b77fdddf2341ca4607712af2ded40f. 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/USCGJ0960856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd296c53595448bd9874fee33eada17565a5c50546712f8406e5e6759f67e40b. 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/USCGJ0960858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fa13d0e16b227dbf8c7c8dfa2de47dbd7bec99f509f7b4ad0611cb2d6c6b33. 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/USCGJ0960861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3a8e2b4043eb861ba0621219dfd1a74912515fca04d45060084e96a5c2d74d. 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/USCGJ0960862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3069eb29bcacda34d8fd973ea8e5c50a9df1fcbecfa52ca5cca07a6edb84d5b. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/USCGJ1259739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8d48587ee020d73bfc6285e9a3bec0c4b7c07d909d44e116b67a50630a0eab. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM21532377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f93dc0ce48155ff4a4f95b4c7fab6e420e81c20c4fa8dc60a346886b435a60. Chain 2 (Bitcoin): anchored in block 958677 (2026-07-19T05:47:23Z), 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/USHM21532379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936ffa2cfe711bf19eb1796ae8525c68c91f027cee3726495469bc0db8ffc515. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/FR9T31900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4c9ace49948b3cae533a21438dfa90520f3728aa76dd3ea94039e59bc23842. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9T32500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9429e32d3f6677308e53733d4cb10452e250376a08e34ace766b618b3be95c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/FR9T32500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19eaea0be43f14844e7233db1be744795ce79bc18b3fe0affd9a3fafbe2a012d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR9T32500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a41d6ccef0411ec4459b5e173ab6b5c03c0b8a7b57bcfab8f2301b90894f567. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FR9T32500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79eca7fceddbf4f9784959f9ea2c2e91518e15093c691a42757a140830d67aa6. 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/FR9W11721337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6a682a808110d9c1fa71a0422b6871fbba43af3e6f6c36c634b8b3c00395a3. 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/FR0Z41801140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6a682a808110d9c1fa71a0422b6871fbba43af3e6f6c36c634b8b3c00395a3. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/FR0Z41801140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ce01550b7a80adfb1d6de0efcce13dddbf1b4d4ccafb2e1ec2f61e6f94eb89. 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/FR9W11908849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ce01550b7a80adfb1d6de0efcce13dddbf1b4d4ccafb2e1ec2f61e6f94eb89. 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/FR9W11908849.