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 0x923dc78bde99f8d62bc14f5bd9ad3291b6897d71909eae30a955644a7a008b89. 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/fabeee8d-15f3-49cd-8c36-5c7a4659f291.json and https://artists.proofprofile.net/proofs/artist/fabeee8d-15f3-49cd-8c36-5c7a4659f291.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 0x995812c245f3ac22521c3b4f3ee6599686bf08333435cd0b42c75b6d98866f71. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMUPQ1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24cc0473681d9753330e2b184f57497e18359d75ad0fc98abf2e3022423fa52. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QMUPQ1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7332e320e39854d57469c9dd401fe35ddc2b9d2f0de890167d69d55b3b7e6e7. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QMUPQ1100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680f819deff71e1eeb84e02841382eab2698e7befde607bdc5684490d5931791. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/USCGH1593298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe288c17901ce79a67ce249ca392579221ca53bca2aee5c960afa0989123ea6b8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USCGJ1630434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8d864e7e14df72154b4c59d46e9684852a3f2fce7de3e70bd610d87a727550. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USCGJ1630435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9e8920337566f6646708964b8e4bc46dc1db3fbf462b72043f77565fdf6aa4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USCGJ1630436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654660163137f17f8073b87ac416c24b672aa8e4a18863a95baf7616cf205549. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USCGJ1630437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4747aaeefa34b6f77582f0efcc22ec11b0c144d9787a95051e8e3ccce20dec1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGJ1630439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8301a5102208f5d8a524b59da47a6bf2c418d14b3c77389e1ffb7471fbcd45dd. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), 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/USCGH1912352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd343e1c45258c9de41c3b3baf0feea205fe28682db7d971d896d262ca3f4b0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZRW62100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63580221067cc751903b39b8d0655fdc9068b0e8124434a4ba949bd69017e5af. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZRW62400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb4b5a18a31eec83fccc43baa791c92320d4e27223e9788d2b02a60d49e7310. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZRW62400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b15d0d30ee46a57aa3a72e16c40b44ea6be03a9eea792d36886b45d0b6cd6c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZRW62400305.