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 0x38e8498e69d7101e72e44167ae84b9bae0a58f2a5662b40f9af076df016e2bc1. 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/6271d2a2-a151-447e-a318-83fa3da16c9b.json and https://artists.proofprofile.net/proofs/artist/6271d2a2-a151-447e-a318-83fa3da16c9b.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 0xcb0aa594c9216f979158d421b996a20b14bc732991296bbc5db17003a38b1bb4. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USZZR0810135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970b53974c2637856bc3d0183be61710e06e3414f6156327c4248180abeecb43. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USZZR0810136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a30e64ad3539f87ae5a65002fc74d66de11f207bcf2c6663b6b48535f4b2b4. 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/ES28A0711203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc21e2c0f9e00ea8661b2f88466d79ef03c4a8dbf8b55c65a9f9491eb3e7c456. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/ES28A0711206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e82d64ce296389a3dd16b3d8aed7487fccef45300c053f9b11ab1166084d402. 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/USASN1601449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ce9c0d35680b1db08f947e211071819045f33cf4adcd7fced3b8e74cebae11. 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/USASN1601450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821ba4cefc058b67f9d69d641d7cffaea4ba262bd2a9fec0548e12cd19d970a9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USASN1601451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6592b2b00fc60fb934663569d89f7aa4bea73296299abdd719d147576e4b0ea8. 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/USASN1601452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe95d41cf47aa0cf0e89a1ede0d435b9171c80cd94d19aa84da7f39eb46ed4bf. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USASN1601453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96042cedbbaf674de67b60929a39beb5860b63b667fbd962f6a01b1aaaed3924. 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/USASN1601454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc11313f90193f560a7857dc309d3f0aa7350bf3f96270fdc28774eb53a2a281. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/USASN1601455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa0746690ae78b51cbd5447b279b2c65581352ed650bdbdcde3b7ca4ed0aa76. 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/USASN1601456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9427834f120025708539273a156ae80d6ad2e80d2ebc10272510b8119e420d. 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/USASN1601457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bd2404ff010efbb0938b930db126c8e761f7fb14252d03ad8448732ad3f0fc. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USASN1601458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1e8ea5bfbc4abde8df7db36fe1fb5af128090c748b83d22ff1a1361ffb994e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/USASN1601459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39e927837897b059de24aced9a256b65d922bd7fd1dc61b98d0c082b7445821. 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/USASN1601460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe136eef91be0e4f19a80da1012cbd82c0461ba0edd4ea1adfc5d15b84b17c11e. 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/USASN1601461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e2171262466340e92a42f8d3d6d6c924e211ea56a91490e3703c6f312f7b10. 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/USASN1601463.