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 0x63f339c7e3a0e36b681f376d8d1bccfd16b0c6c6d47e00ea833fdb58f3401192. 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/14d644de-ef1a-41b1-9799-8e87cd63cade.json and https://artists.proofprofile.net/proofs/artist/14d644de-ef1a-41b1-9799-8e87cd63cade.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 0xa1633f0cb615952750accb213620a29387689b2ba1635715345a988651d459aa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2416549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3977f0a4691aee475978f37d0e30b3a4b17a6b4a74bd5fc87f849013b152b6ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2401058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e74ba0a85c6a18c6918500f807df3a5040d00636dd03aca22f2361c18d8b2a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de0f7bec5ff1c803600945154562a4765174b4ceba714ab9d191ee67560ebcc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2493895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13edd9c47ab835f4711a732ac093624b141f53f04ef57c2cfcc657ff16d3a28d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812414483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22775eaec7e711e228ffaadfed3555f90feb939d1edf4cea24450ddb00f2ce26. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2400986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279c50c222670863095704c2f609969fffb428acc59c7e5121c938b507401545. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLT2H2400957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7018baeaed6da23a38f5a146615e2fff95367c50003c724017af3ab7e3681cc7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHY2422486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b75d60e6891941850bab06f9866e548c637ed93756597a2d11c5b84daf279bf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2442052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32c5c953f5c34ef16b1b8c1419f6bc69c0d2688a940aba93a0f53fd579ff18a. 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/QM4TW2442053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc090336138d61bdcdd72ac71fbf592a42176294cf0006bb2aa45f7c99fa5624f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812368255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79545f05156ca0b3c7324cddedeee071b348c0d8f2a0ca1c429a08ba91b66122. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWDE2305029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96081504f3856ce4ef0130db7a0bfab76814fbccc96fa7c7508a19931797e52. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2300592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79f4265a3c49e84f4d2e9f3b6eed3914798df5c31c9879b777d3f6023be0e91. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX8LE2286094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6361185ac28fc3c06a79480c2523e0198acb8d2d47a544aad7b806aca7a8481. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6MZ2265621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d4b689aac335cc737342d4bae8a883c05c872673694534a20311f406aa7d66. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:24Z), 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/CH7812195218.