Calvin Alan Byrd (born December 17, 1979), professionally known by his stage name 40 Cal., is an American rapper. He was a member of now-defunct American hip-hop group The Diplomats. Byrd made his fi
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 0x01eaa3dad6d50312f9f92501044ef270c5628516e60d8dc83258f652c434d44b. 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/7bd463a4-743c-463b-87a7-852cb9a26686.json and https://artists.proofprofile.net/proofs/artist/7bd463a4-743c-463b-87a7-852cb9a26686.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 0x839da9babaad310a91ab5c2d6c10aa9fda45aa505f43e967fef2f665aef9856b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USA370664101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a793baa9be6ba6688607b341b610d086cd1825b5a6cdf87da66b8b17253b030. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/CA5KR2089285.
We Getten Cashed Out (feat. Casper Capone & Eclipz)
When I Ride By (feat. Killa A & OG Insane)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6de709b1d70bf6252af0fc4480f7cf3fa3d1945beb0aab985f988518465296. 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/US38L0702582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8a71e1f4e88a4a99588b1de41385e82baff445518772dfd3cd4b39f28ccba6. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USEA20900183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779f35cdaf6df17b90547541b1a94a6269203a2e95d286caca1ceee17f908a83. 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/USEA20600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa012ec8f46bbb53f5a175958add27588ac5702ee5ba064e0537694c7a397e6. 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/TCAFW2137555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb55f49d52767318ef4228bebcde5716d23e99d82d6b8c5f45c70036a0ca33f. 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/TCAEQ2010971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f26e3baad64eba0241cb0f3730fb39e2f17843a09c7b0c122ba9277b25cac81. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMGR31993373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6d0cf289566f7e5956ccd750c1c80e741ecbed246b9f9ece3820c9ad555887. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US6YF2300157.
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 0x0526498f4aca4596b6b8cbdf3ac1d07cd8c041eda52aab3c293ba527105130dc. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US6YF2300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a526f0afe8287d004c4a5343fa0e5c81c7cb26b22d7ce1cc36b92998bc4798e. 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/TCABL1344794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27067589240c3c50efd382a0fad67aa60010595ee4f0e98e2ff9c9f3d4de2d73. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZS7J2455791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf06287031f8256d76797a799bb2c0f9a99e8f94392341ed1925ff4f9f231857. 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/TCAJA2453062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1436cf3f6627cdf4874b5b774c4bbcb97da96f73831492aa4aeaa5526eb1dbfc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAJA2453072.