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 0xd371be6aa1eabbedd863cdd2c56b9d449316a86a839e616fb830818849605c9d. 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/cb56bd2f-8b4a-436b-aa7f-8db2ff587421.json and https://artists.proofprofile.net/proofs/artist/cb56bd2f-8b4a-436b-aa7f-8db2ff587421.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 0x17355706c952af7e6436bc8c0bf8e949fcedccca08bbd0d5e8f92165f780099c. 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/QZK6F2166279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92a80c83261b8e2a0925e87bab83633c07531a8cc7939a736f812820b8d5307. 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/QZK6F2166280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0934db0a84557f195c5e701859dc945a6b55f1e196fcb6b60af7cffb75e7d8fe. 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/QZK6F2166281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93ba788bed4cbaedfaec513a7dbd673ddbd0d22c134571aa76ec0fec0155526. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:44:04Z), 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/QZK6F2166283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6111321c0b9ecd8e963e645b09b7ec2985220f1e407e5ca9067e27177a8b8000. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZK6F2170751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6111321c0b9ecd8e963e645b09b7ec2985220f1e407e5ca9067e27177a8b8000. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZK6F2170751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc497c92f145c61205064417f21d883607cd7ba95faa83084058132f6a51fdf5c. 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/QZTAW2261433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09305ed849a0e2574527c22bad33829870b7a469005147e1ce583d53e949f863. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZTAW2261438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0e4ef5fd8531225ca4ea078227aaea23998d5a806bf40a6f81cb824b8be451. 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/QZTAW2261440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01554aed3e4ac3b2eeb97ababb258322a389550c9957543f2c5270a5247b4725. 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/QZTAW2261441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbe1607cc459fb373d67169a67c9ff24233f0e28b301a55be222f7eab634824. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTBB2210515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ab2ba8eed4cc29600515b89a54eeac655fa5c10ca7de5fcb5fea03a5ebe1fa. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHNB2395294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ab2ba8eed4cc29600515b89a54eeac655fa5c10ca7de5fcb5fea03a5ebe1fa. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZHNB2395294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cf58ccba715b6cf3dc7d0d26ba86b4c0498d89d03b4b8efee5bd17c1d35d9f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTAY2306152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa622c53da2f3e33f4632e61199c98ca58b4f2f03e092c14dfd926d4bd23985e4. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZDA82484322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2726f5cefb405610801c9912276090e11b77cba9f8155ae6d3a6da0f04b25e. 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/QZDA82484323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b904e006bba43c1b1648277d8e423a17413754bf6a068acc4b0888bc90077fd. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZDA82484324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e36cceacabf025b909dd046bae85cd57d4e622fc2aa1df4e04410b6cccd4e37. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T01:00:52Z), 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/QZDA82484325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3168102d06bce9e9dda20a184f776a9b9e5347ab39bd0a81e39d2997af97f6be. 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/QZDA82484326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420c3343a1eed71fc307abca02c71dd9d1d0c83d025fc426c53150b5e65fe6c9. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZDA82484328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe614a868c1a42fa93401247a046066633dcdd32d8910ba7e26847f514809a086. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZDA82484329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6661f4861a5607598f36dff0b1b073a74695b5efea3fcdc05f1258f47eda00a4. 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/QZDA82484330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc137746a7619a21a922a2c7ebab64f4e87bfc05355c49d304ea3e23cc67dff5a. 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/QZDA82484331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d3197db4fc6ff6b12b9420bce3048c2570a9b25e1d674437315cd4ca1154bc. 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/QZVEM2562728.