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 0xe72b5340f1943a65e0e8ad9a6c0efd82c6201d718545b36516575c56f392b811. 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/e83febfd-b412-4e32-ba45-612413ac7680.json and https://artists.proofprofile.net/proofs/artist/e83febfd-b412-4e32-ba45-612413ac7680.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 0x1dcfa0407ad480fb9446190b5fae54b67b3b74255e23e2763896b92551417fd2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAAZ1122648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18046bd0286f58e3c182aac9ce24262afa373b28b27a2f151769f1609e64df87. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCABD1270523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac94450f834fe3e72e11b1bfe39cbf0a5c575eb883a95f5e5eddb89cb2a9e9ab. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/TCABD1270563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf5bb42dc96c70100c82c333905697ed2dbb10ac0113d454a221973d1f263cc. 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/TCABD1270591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64ae497eef5e28be55c3304a2c73858c41440360131c642769e7c47718b0245. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCABD1270652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baa2cbeff9c85ce8adebd6fdfa8f239df6eb2fc7d4785f540f23943caf4878f. 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/TCACK1501495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b951d0394fc5aadb5b066e95a9c884440e1f1aa3d6a107d88dcc50c3e49f9e. 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/TCADE1757902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976c98b05085bc690ac1a2e4c94c907fc82391fd3b13929972be2cef2451de04. 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/TCADS1881129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289eb4fd45e57d6c2c419c2f28f618893b900e2cbe549b2e9748560776746fea. 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/TCAEG1983318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98810ee86f77ddb63db9fe08cafd16b635def4b046632f3e518082d809beea68. 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/TCAEG1983322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53b8ecfcc239cb965b238a5c5bdb81ce76b3b9bb4622ce1d4b671e7e0a53401. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZNWT2186527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b25ef2ee91abe2dcf8b4195a41a2ceb8c76c9c0a67787a2bb07fc572764fc6. 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/TCAGK2216158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb516bb2051a1662483ed60fb3bc2b78a25d611a539f82c4f2dc2e43a2bd4ccf9. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCAHD2371592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386181d32135b854e3c3978ba9851627660f15177e14e977488e30e26880d8ae. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/KRF222300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98be7e42b8af8254172ff8692cc50b7450fbfff5893a35edb4174b4c459cc80. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZNW72405827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b448168b83ff7a5e9b4764efd14e71fd6d4bc237304822b6da95850b38c61a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/KRF222400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163266f1bf16fa27f88b0c2a09747920405507e07fc46cf33eb0bbffa0c5796f. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNW72405829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a3a9cb178cdb8c1ce4bb719b47281cf7ce1a6e860b2fa65de9a181e4f87a88. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GB5P51800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7463009285a7fd33e3ceecf2ac2890da908aed3f46709d47c9a3c5a63ebd5ec4. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM21866776.