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 0xbfde2f321f4304bb28bafa3c291cf7b6160c97fa03c8c45e890bbfc97ff1486d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c998c1b9-b7f0-4209-8ff1-2acdca98bb62.json and https://artists.proofprofile.net/proofs/artist/c998c1b9-b7f0-4209-8ff1-2acdca98bb62.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 0x8e895a2313fa76036cbed2b18104a74998a87d34091bc5051e22287895b63f4a. 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/INW132417982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b69eccbe62db532568f42ba53c51c17173f9d4e20ceefda1234b002fbbfc8dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INW132418001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d560258c98f11c8d756b0814392c146a64a7730f8441983466b2a49e9e2775. 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/INW132418058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648781eb6d522c040afe5c029dd0194ee41afa047a6bf750c5f4d3c3eb059869. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/INW132418068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33410371cbd394cae9b47e4e8e1c99893201a44b6414e00b24978b953700e9f2. 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/INW132418107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd1f4177371de139060cb9d08e4f96d648be6da6f952ad271e505e05dfbbfcb. 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/INW132418147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31e4554df6ffc30556c0a0d7da766ef71563b87aa89b9b923c78cb141d5a01b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/DGA0Q2429393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f4fcdfedec2333e48887e750e3b0bc4c013383fc53de7208aed20938f49d07. 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/INW132418246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d4b936dfd2ebbda866fc77be8f654f70ac180f914868a6e169af509ebf2506. 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/INW132518310.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1af2fefeba179e9df1e4a9ff5fe59b9726946c2e8eecf347792f00a0d28f1ca. 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/INB942524326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483900976c48fdb21884a96f20890100a240e323ee7a1abc242e165cc263592b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FRX282523968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3103ba779751d7436303d6e06fade696ea3e2c52684da0f379976b7b10d6ecc. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/INW132518424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871a9ceea750a52fd89fc842c9fb99ee594734b56228032dc6aa5ac34f5a27e3. 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/INW132518452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed85bfd0a8eef5e607a060d1550451d6e36f3fe21039b05c1bfcb2e5270492f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INW132518455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe8029c693ce275d11526d6de4717c0005334f90bc931a09b07f91daca2437b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QMDA62520281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8739c65e3cb86b8cab3e47cc0ce6c0a7933905edca1a2baece124b11a887b5f3. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/INB942531802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547fccdb834d87bf2df4b5e1b3eff02ad851d783aab997a250b4a19c8c645dee. 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/INM1K2500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4ec0cde26f3bf8c1313c1b2569748d21be3f16e7219f1db3b76bfebd0930e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/INT782200430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd14b974ae2b413697fa9670aae5d51414c50337949f3af22503aca100a803c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/INW132518590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4813a2adf87f46b8671472696e5fd64f70a61fff601658fd5b1f57dbc14a21a6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/INW132518594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e33d1fc5f935cf104e5ef534053d9a24ea9f4f11e7dcddca0e29e455daf81f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/INV1G2505020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca7e7828b96d1829fc640d9732ca7b85c748bf7c2c28ab87d9d7deff0018cf3. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/INB942533884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8fb1bc5b75a48da6d5570a3c886a943baceec175886f5e1103c9d0fcbbebac. 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/INW132518603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6c97a2548171d4468686b6369b98bde9643dab3c8d9268754d682263c25d9c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/INB942534050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef818405024ff7f45acef02822ab0a620eae64b3417e4d562bebf22ef79bde9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DGA062541406.