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 0x67e49c0ffa2031e34051d058f90a664b4326338fe2c587fde6b7666cf88eefdc. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa6e6c7a-fdd6-4132-9f0a-ee0f6e0d649b.json and https://artists.proofprofile.net/proofs/artist/fa6e6c7a-fdd6-4132-9f0a-ee0f6e0d649b.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 0x8178379c1a9bcb9d94bad1ed9ec683fbbba104fafd56485a6a0cc0f1e63e6849. 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/USJE61303320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10553cdfd78bdc2c1c8d49289690e07e140a2b609fa5acf01cdaf65f5aef5ee. 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/USJE61303307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9205de4905b153473a0aa72a26aabd37774e07a4424aaeb863ddca789ff3e8de. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USJE61303317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10553cdfd78bdc2c1c8d49289690e07e140a2b609fa5acf01cdaf65f5aef5ee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USJE61303307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22a2955593423aaf58d28f71d9c28d9dce605dcdf47e063dc875f8c7deb4b45. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCADA1735429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb579379dfaf8acd97bf13c27e3e9d16cdccd6d76710707655d08817d69ad7f0. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZMBZ9800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4017b4b86d44691c7f6185d905e374f793b7e16d01a55ff08cdfa1e73fb8658. 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/QZMBZ9800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fcbb1c39cacb6b031dcf62704500a771163700ff9820edb64c637475957ab9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMBZ9800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e987a6221cc6d4380d8facc5aff61615940c076bb477877029b31001f895e7b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMBZ9800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2955e70641ec6238a6833e0203a01f557bce5d478feae247d32befa26bd44b3d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZMBZ9800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919da165b55e96a57de411498f7a6617ad90bf0a630a6891198a2f20f056e068. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZMBZ9800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85770ae56defde5e0506243ff5a627323608c949cd3aff5723128f1cbce2c8e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZMBZ9800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568505deed5b21b543e75a0be3bcf32cf6d0744b5ee5175a2733db39e6a2aa30. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZMBZ9800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa934fe8c3acc7868c4d2b3f21136441a7a44ef63e736243915f9d83ce9567af4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US3Z41100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04fdbd87235c924f095a3ce207a4d45a798b478d40b5abc1956187b6ea38b1c. 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/QZMBZ9800011.