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 0xb561ebd19e218832addac65f452816374d0f4a5dafa79ab07345b3d5c2760d0c. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e02aaa8c-9368-4eb3-a3d8-73f16ca714d7.json and https://artists.proofprofile.net/proofs/artist/e02aaa8c-9368-4eb3-a3d8-73f16ca714d7.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 0x35a50bbbd50063f13cecdd66f37d93ffde829a09bb40b25461a0ab989574f90e. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/TCAEK1948327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7791edb47fabc963dd869cfc49d75ea103dff82506ecd92a7eb31e783202263. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEK1948334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce18292fb344d802700c6ae77a830026ce2ebe527f5e0ea200d9e658e6b1b1c1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAEK1948352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f7de292f9e757aea21bbe85435bd7e48683a548febfb708c60664e61d127da. 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/TCAEK1948355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c15ff492c805570ec09d67f667c4c07468f08d7d8ab46d52bd513ed5a98aa7. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCAEK1948380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55798a33a78684231239a26971bc0e9bf0a27f27f1fd7d2e7a3e77732679a109. 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/TCAEK1948381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1b10144c7011cc75b04a1b8f9700d52d443dfd38450601c20c23299483aac2. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCAEK1948397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa74f336db2113130a31ab9a91a1558f0394e0d05763c14f798363dec6235e4b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCAEK1948408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a958931213c23d6168be0d2b834ba520ecfea3d2413d9509beb9fc5e06b267. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAEK1948470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc275e0c94019c2e1ee5ff3d2d6f4eebf8443ce60a8f18ae000019cd4b8055b7e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAEK1948475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322869ba44dde4817e0ece7185cc7b145a5b89b7988922752a9b3facefd33640. 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/TCAEK1948479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a0aa1a8838a451d113d2443ef35b26cd44386a89bdb0d4f5a5dc2ca95bd87d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAEK1948497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8abc598da10457cd63459f34b83d85e61f1ffd3d89e4b17ba2dd4f883c9615. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAEK1948501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67cce171c6d65ee2c62d0985b3edfc6523364cf593675d5ec70ea037b1f5171. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAEK1949235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcada4b4b04070775ecb31aa2ad393deff1d7fb067600b547273dfd913f39ed7. 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/TCAEK1949238.