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 0xae708a916ced76fd6b23cb83a7dec6ccda7fb30f80248b9eb7b6a879a27d7bfb. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1927bad-8ec0-4a5b-9755-0a482694efb3.json and https://artists.proofprofile.net/proofs/artist/d1927bad-8ec0-4a5b-9755-0a482694efb3.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 0xc99f6093c16da6f655c491b565151c1195205d0655f6bce0a6a6ad3cb5b71d7b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ESA012519520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44a09002d9aba32d540ab4eb3d817f83cc67dda142cc33d388f9051cc7fbaeb. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ESA012519528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c7489aa506b2a16ce5c8777a8ed807882391dc985623c9dff61f8dc916ecb8. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ESA012519530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85278cfcb26a371f5b857de83da2a7015d3f4ca13347be289ff0c10f7eb98998. 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/ESA012519531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442022976a73100797ee1653edd1ddbe177c4c2f8775b7b4def9c3093a905a9f. 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/ESA012519529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d09f160fd81c30bb95939fe3c10c9ac554e2cb6d3b3c0d66d3329eb15d127f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ESA012519523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fdf4d015aabf6522dd28c399492b65b197ec3aa90f5016742de499bb526c3c. 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/ESA012519522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73608ba3a1fc89aee21aa7e6233deee2f43c54f2a0c9e89ddd3f46b1a2e9d6b8. 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/ESA012509791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1792bf762762e66ce37ecb89b3d8627612d5ace8e0e2ff9c68f4072deb4a33fd. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/ESA012509794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89c5e5c3aac5ecda9a2433bc42423a10534d7d48f272320545509c4918af563. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/ESA012509792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41274df5100edc4468c0d6e4122339cfb0143aa71c557b576f5efe3fbbf9dec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ESA012509790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720993b7443aaf9a9389a44c4ea3237b0ef9136d6a8b5ea96e310dc9ae8d4942. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ESA012509778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26904d36c0476c822880ef77f8bc4d8903e5c347127ce9573dbe6b7fb574c5d3. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ESA012509798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91b6c75041be7691dd0c6058d1b7dbc124df4d483a14f5cbf59326f92687855. 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/ESA012509796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22f1a480354f55ac25ec019103fb38b3aa64c8d2841cf9dca864a51415da40b. 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/ESA012509797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e865d3684c321a1e6447e9d7753198a26a24855d777921b5b8bf8fa3ed6be. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ESA012509795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd96c2d452a42cdc6fcf77bddf6bcd8a789d1acde9674d4ffe2c0eae6aa958a. 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/ESA012509799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff91feebe8ca52dc8539c12f5aeca25c302e9e24a20b2e00660328cd303d5dd8. 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/ESA012509804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b60bcd5719eeca5ce05185d6ad5f4b52b76b7c9383e532bd0111227ba70017. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ESA012509800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83a79f194b6c0a2ef661c46cce662c21c4be89c8fcf08d6d6eaaf488af8b86a. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/ESA012509801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9139630b91bee3e1838d4ad60d2f32932838c228863be8439760779a27ee82a0. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ESA012509802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b48fad49f7e45a714b23113c010b706389066c2c9d18f6acaec3417812f8eb6. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ESA012509803.