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 0x769c7add76fe6daad43d83914714e386370b3570762e526e9c5c35375136f49e. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd8c729b-ca3f-479d-b7c4-06ac2cdf9d62.json and https://artists.proofprofile.net/proofs/artist/fd8c729b-ca3f-479d-b7c4-06ac2cdf9d62.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 0xeb8e5ae372008af5385c8d89f23f4d603ece92d9a85ef9f43119c2a93fc519a0. 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/ZBNWY2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca8194369c1a406d519759dfd18646cbbb7da2c62dbb6d63ca6ce004dfd2f1b. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ZBNWY2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4253d8ba8c02323adfe368f4917e1b9af89801ad89dc4485cf895303878a0578. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ZBNWY2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b7e4b27040816db30acbff236ba927d22eb8fefc03c65aa7255c21227e1d03. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ZBNWY2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94d1f7262a15580311b3ca6fc2863208dc6e984bc043920435616eccee10079. 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/ZBNWY2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531429d32250392c2db0e93b44f2e78c76b7acd3dc7a9c2dcca3b66b7b58cbe9. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/ZBNWY2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31f7350131a056777b1d4f40d1fe8a8b0cbcbe13d8fa90f64c8019350e768d5. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/ZBNWY2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222754b93cace7743d7e3c782eb43b164831496d5f97f93f62c844b194871b6e. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZRP42591400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62eef166f12033258d57c94a538642970212b99eab9a45a17e2f39b13261bf62. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZRP42591401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33b9365dd07dd40ec801ee12f000a88dabcd68faf802ca7ce0d58af426822c5. 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/QZRP42591402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924ca9cd806cb78d952f34bfc713d7546cb2be07a84021e7340ef1ea3bf5ea5e. 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/QZRP42591403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0691f03950aaa08d2d9030f8e0353597a7b0914089852c0726294d36ed86c36e. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZRP42591404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb326cf6f6545166da5301de4b0d4eecb3f69d17299f356c474ec51ca5835679d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZRP42591405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b817f68314f361fd6e372d0298d6bc8d9094dfb0ddf78347f73ab3f76ec1da3. 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/QZRP42591406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6898f294af45aa9c685010b936aac95cf4b14f65663adc2feb3b1ea59cc830. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB72513077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6898f294af45aa9c685010b936aac95cf4b14f65663adc2feb3b1ea59cc830. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZTB72513077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24df1d2ebdc40e7c88573d9736254118e6da3219728f0f88688580ae19f63491. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZYFZ2515590.