Son by Four is a Latin music group from Puerto Rico, well known for their English U.S. pop hit "The Purest of Pain (A Puro Dolor)". The group is now independent, and they founded their label SB4 Music
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 0x87eee4587c751b7cc599fb0bd88ea159660f320c1e96e6f356a18bd895677148. 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/c0b31a6a-dc20-4228-aeed-d2f0e9d58813.json and https://artists.proofprofile.net/proofs/artist/c0b31a6a-dc20-4228-aeed-d2f0e9d58813.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 0xe8a334788d04e929991c7c6212657137930c5e29d72d993c519f3832176559f6. 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/USASN1300513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb98c108a8afcb2ba3b260368117dd05b096aeef870e0a9753c1198f8c48073. 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/USASN1300512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f92cc885f81aaabd3403cc10a40e8779e38027bd04c9da9a2fb7e7bf04c7f3. 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/USASN1300509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a540ba733cf13acbe2d73975c0e65208b72f6d8fece523ab4a28b6d55c6c89. 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/USASN1300516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eec3fb517f8adaddc2c5cd563e1f2ab24244261d6c59fa879a270e3cf2244ab. 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/USASN1300503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732e0d8b48c4b4725ba8dc1e5ecf63644433b3237c95908ab25e4259f107d3d8. 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/USASN1300502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f90d5b7340e169a535fe1c66bc35927dc0987318a50a41c2b894299807575e. 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/USASN1300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2790bcb50cc6357d52460a94a994b610060fa3e88a08ec32bb6c46fb24e7670. 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/USASN1300498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130c397960fccaa40b8e8dc5d70a5a8c6cea34022639cf925dc2f95461035fdc. 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/USASN1500738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed33f1eee610e1b629b1c85e43d6c2970eb69b05d9df64c7770efac0c4ab15a. 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/USASN1500734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f2cb24200ab66c1e8cb1b4ddb0902a97c2c0c589acf96da0b7f0eb62ef1c9d. 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/USASN2000847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774eb0d38ee151d77a84a8dc7b4d6de115668202d0f63bb1bb6782e6f897a726. 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/USASN2220614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece4ef2d528f30e6347b6339455290869e29a52d03577fa23f76dcf70491a71f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USASN2101790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95af08c16df7be0dcc67f8dbde9dd432e38a475a8e57e8780b779e168caf1aa. 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/QZTVM2138012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa367351d017abe884f220e9be64f6d894575ede45cd3581f7824ccb0f8ed46ca. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USASN1300477.
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 0x17a71f7808cc7c0fb9046e88b2c2b7fcafe5d3c8e6c6cc53a922b43e07b4a91a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USASN1300485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b5bc35296c343dd0de1cf603794b81706ad1dd4c5a1f7531076eb436832eab. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USASN1300480.
Mujer Frente a la Cruz (feat. Claudia Gonzales)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01131e26ff58ccdb519dbd00db1db555faac45b55deb92a356237cbe2bc26b7f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USASN1500737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40977f8e5e1ab218b2796942804d9bfa71ce2bd7a15ded933a3dd12481851740. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USASN1500735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac95fe10bec92ccdb0c200046855673cfff7bd8f53e69d72fb6917295833f93. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USASN2001183.