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 0x4dbf2fcd3895747ced34b4ae50ecb511226eb63a519451409eeaa6e3bf59350a. 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/f38f1055-c0b5-45d6-b032-aeeaeb09ce75.json and https://artists.proofprofile.net/proofs/artist/f38f1055-c0b5-45d6-b032-aeeaeb09ce75.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 0x02ecd045fcf6dd4728406845619007518266d710627d007f237c9f1ad2868017. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEZC62130246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fde9d9f0ad04b9f896cfb9dc58e3e196a95886171470934de238495bb97af9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEZC62269758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1213bd23b5248a55798d28029738a142e198e8f29ae92554377d325ce7a635. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:01:30Z), 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/DEZC62369171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f018d2bde67f8e7446075383c8eecbc2294d4f825062d0da29b7c9ddfce580c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEZC62435580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe7f6c6b13f1f2dce12d2dc47fcb6f6170f1eae1d9977c9a6b1a98b8c8e5020. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEZC62456382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b69b8e1a6cb9e3d676d8f2a56c761eaba670e9170c7dc4c2099759e5c985eeb. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:40:49Z), 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/DEZC62456388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dd9bc5664716b04a068c92216f445a8dbce786a7c07157e75d6a6933724751. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEZC62456390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f739e2ae6a24a0a00b96e3d8c56f9f5d6dc6addb16670be93fb44454838b03. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/AUMEV2547578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d88e410ec8ad7f2d859d490c55655b797f9dc9e07a31dfebf2e38adfbfb8678. 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/AUMEV2547581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac54352216d071e67a286fa44d2b7c0228c8041fe730e4bfb02fa94321f7239. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEZC62591390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f0f1986b74a906eabf40dd26aee36e3aaed335775d8b9d58f44139e39cd365. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEZC62591391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2f1a305db9907c2ed921df8f0dc95062610eb82b7180c1a89ecaf117c23d3c. 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/DEZC62591392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560aeeb91e39bda3256b8d9be6d85ff7927818a005c35cba959bb2e1b8c865d8. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:47:32Z), 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/DEZC62456387.