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 0x117152d24ae2e822b3a178a5a6151db10b0b0b0bb4cf16f0dcdcf12e5fac589c. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5e8e848-584a-476a-8a4b-94f59f5df772.json and https://artists.proofprofile.net/proofs/artist/c5e8e848-584a-476a-8a4b-94f59f5df772.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 0x770b1b21defa63832489a3937571fc050847af371d3e5349dd1452667f327fd0. 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/QZZ7V2523833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa30d941e0161eada924dc3a6a0708a0eb0623da1982ce053b7220ee63f4559. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZZ7V2526193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bc80056a7ab16bac53a2cad8a3aedf24ddd65a3810e678453f944d75228457. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZZ7V2526192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8144fa76ac5d3e6b6060329a0ad3dc3790e783ad6f112548ceddb44e5e8f56f7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7W2523828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6a1c51ba7adb8df4f6e15d31e2ba88b9de73b4ebfefd77941e0b51c395f9f3. 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/QZZ7W2523645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19d05a5dd81929044b6c7897087111e9173bdd467bc8d0fcaffb1c5b12caa6e. 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/QZZ7W2526637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d987ffabf1225f8f2efb0f913332f7900db3f6c2bd7edb8e3fdf2c14e9560b8. 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/QZZ7X2519336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6c5f32fa61963a5387f46486040955259821b8c5e63f9a75d69a34829c4158. 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/QZZ7X2519322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe907ae8f239b1b75f30d6efe3ad724a567d13431438c56f379dff1d8e09e704f. 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/QT3EX2524188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fa7963d403a8d2b09133566cbdd00c268dc4bf853043e471810007f93de54a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3EX2521262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4094fd3ef3a7ec7c28e3e3765b4c39928149fb2b07f427951faae7a35fd6e8. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QT3EY2536169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ddacb53759b8339b134cb526cb2fca2a09b649aaa83a512638d450688a1868. 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/QT3EZ2537370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1dbc22922915836770222c121c58ef7c8071dccf1cb942bd3d8d24f2178bbb. 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/QT3EZ2537350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09025b1660a055d529976f02dca8ee26bec1683b217ffc7a08fd74fe02e11979. 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/QT3F22546580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35426d0d9f2a91955373e1e7767475081b2f718faa31584ff70de37c464d5261. 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/QT3F22546525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6573ecb1805af901ff83952092a5b95202ea98fa927b61230c6970c74897e84. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QT3F22549051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb170569dff2049812a66d8894c719edca1b25ec69a5b7524cfdf18375689dd99. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F32568900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71efec78ffac4eb46352eb4dd2459a1bbd029219923cd1a8ad22471bd6a75567. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F42565219.