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 0x794431414fef888a68a5c044f11000a961a405b1ea8eb65c303b7494c48f0817. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bef6a0f-2f99-4cf2-b908-1c4c28eed123.json and https://artists.proofprofile.net/proofs/artist/5bef6a0f-2f99-4cf2-b908-1c4c28eed123.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 0x9191cab09ebe3157ff2e406dc19f709ec496e416f7caf877aebfd06995f1892b. 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/TLVEM2401442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8b510d4aa06da8749e843d6ccbd8ce9eaa30d3b8cf0fcd3708a9207254a92d. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QT2VB2456575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7e69946167a5a9d68c773a12ab589f8b7f5fe4c62715ba67f0434c00e89a6d. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QT4K42563430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c7db0dfa871886d583abaad5b529189dd11869aa3f7ca1a73fa60107ecf0fa. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZVEM1870284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da44a82e54b7bc6bb9630a256ee2f8d8a5f5991f0ec380f1d2c6036b643f6f4. 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/QZS662469599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe078914522b86bb15101bfd583df90e56915c9ef6bd6e7bc4122cf6155175e65. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWZ2483681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d73b92204bf6095e5f7ff520574dc49fb76c7d85953e211eb5a82028d8c9e3. 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/QZPEW2579702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1f808e17a766301a7ef25483ebf5bfc7b66b7cfee0a08aec82683cb6557215. 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/QZVEM2567143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8517a20b5c844ede7db3427d3a43f81b3e6e6f1d8052544f8df26f919ff9c7ab. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/TLVEM2456273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba73df12b78269625d779698b84f08b6a657cda32ad3b345784decd0ac705cd. 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/QT4K42556217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e01dcfe32bff137117f13a5aa3eca46cf14bd52f6d5977e414616365defe05a. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZVEM1870283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643ceaaa84fe732cdb8211f7f54baa4c741780900588b2a94b01f80c223965e4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZVEM2524828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac49e87f40548a6c8c66cb6e37b025084c120aa22d346afd95e0fc2c446a7b4. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZK6G2287034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d004ed00b6ee9ba0a159dcae6e99cedcd7917485998a667312aa741f5e2af2. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QT2VB2507699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0a2f3c3963aa878da8c831d03393f76ecbb8c3a4caecd4651aeef54b94f52c. 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/QT2VB2503925.