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 0x677aca8d3134a6d6ce9dff8fd19d03b7cde15cd705d56e8b6a8fd8fe018dfbfd. 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/fcd71a27-8b4a-4556-9c5e-81d50740df35.json and https://artists.proofprofile.net/proofs/artist/fcd71a27-8b4a-4556-9c5e-81d50740df35.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 0x6d286a531288ff35c186130bf414aecd658f27b1fe80cd96cc4c73220352822e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:34:14Z), 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/USZZR1202133.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba0dfe5f7d30d65877d1e34f2639bc46daa482a1bd5c5472e166d1302e48e31. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USV291477765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73e249bf9768d43f17aa004695f4cc5966284c9c6887063ccd89443b9ab1980. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USV291477766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbc1da3a1be667a22af77e00ad833955e2a517d6226dc99fff65d85f4a35f27. 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/USV291477768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e009ed3c36ec9337efb0bc31291b97b25e8b811e4fd0376dc470b821fc77ef3. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USV291477769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e79c5103f87de9661d830e48e5a49b429d9f0ac011403047ff398634888ee7f. 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/USV291477776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fe0db9aff91429b2ed1e004f60adb99a771c3aa9370925556054f069cd3b93. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:27:36Z), 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/USV291477777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70ef076de382d513539cb5ea83933062087e77aad0cce3d348fdb5d6f02ef1d. 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/USV291477778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3deef109896bd716344a432c9f95f2e13c40f8859260f917823dc45122713f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USV291477779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a01c5cc0fe93ba1be9da8558b662e12d01ca93d9e63cbc840314f0ae0e0a96. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:24:42Z), 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/USV291477780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa4c738fe6be65defb7a525e8cd8063a4b0695655b34751e2f96443738f309d. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/USV291477784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7e1c65663d63a00c896916748cf5f10be9cf350a4cfc8178cf0bd89da3584e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:12:38Z), 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/GBMA21874106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c931e4253d8ad4c168dcc596df63adb19c24ac844de625c71ecce45b8a6a1b0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GBMA21874108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9d37683ce0fcd040833ee624ce991df78df2416e0f56905ed7c32d2a311637. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBMA21874114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03eea43eb1dd91e9520a58c0e093b92ec0771cdc792a9168a31094d9778a1ccb. 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/QZNJX2338046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119b18a72a87885963a100b0047c9bc8bf193a1bda4c26823a731bfa57cd539a. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNJX2338050.