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 0x605d964a68c939f291a72b7d12469187eb22bc2c707c5d91290acd4d401ed60f. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/542bd4c7-ca93-40a0-81a5-d63a7921c345.json and https://artists.proofprofile.net/proofs/artist/542bd4c7-ca93-40a0-81a5-d63a7921c345.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 0xa4be892576208f0dba7ef3636bf107289d169608851a48b172a2c63f4d002589. 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/USHM91307167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98c85940d0c74e1df9f530695d1d5abe5c3c4fff2cf83cb1225f91d11899fb2. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/USHM91307193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543bd1442e30633bdca3dfed14b5bcde329943445758b8aa2c5b672e58318305. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USHM91307177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68674050ec744590cbb505e62d55fb5838d541023fea17fa9a36e2c500c833c. 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/USHM91307178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad9dffe09ab4d6db6b6dbcf0e53d062a23970ef2b5570586644e30627969b7d. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/USHM91307179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6158424e97564f1d8eabd4d5c91cad9063bb2fa3aceb7393a74e82e82641aac8. 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/USHM91307180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9884f2fcb4dfd21780b1b965bfb21df262045edd811081b56c3b83d90f6daf5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USHM91307181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701f355a5728306d83bf777ac4fa6809931c9cf6193d44c129eec5c6cddbd02f. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USHM91307184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d989fb862c7142ebc17186029c200c2879b319eb052d77e121f3c10191bbcc4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM91307185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ce51f131723b97c6191a023c8d9691ffa8f887d0d73cd445b31a99c57bbbc6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USHM91307186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5acce4f1c33e23f6c01e52a172140ff67ab0471c39d6451b5e03da2101eb6f. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USHM91307188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83726f607c0455389d95cb65eed3970d6bd2efabe89112956132d37a4fde50ab. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USCGH1396767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c43f811f6596885dc8fbd704cceab295f8f0d89e0c0a2b540b17dd36d8b34a0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USCGH1396768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbdd51002e91715f0aa16cff5a03312966107dd232d4dfe7ad515166339f3e1. 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/USCGH1396769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d12eb28f1b62836aef4da42744a6225e7469dc9bf966329560ceb42f6acec54. 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/USCGH1396772.