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 0xecb18444805acd5adb2fc19d4a5c7ec1da3293ed39ac00002b527b05c711d8c9. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/140757fc-eb47-4838-be71-fd0f5018c106.json and https://artists.proofprofile.net/proofs/artist/140757fc-eb47-4838-be71-fd0f5018c106.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 0xe42325a8fab7bb3d24b3bfaad96fafd1b7355debdaf31abd8e7dc9487d9ee97c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAU2229206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8523e40053c6b6921fa7f1cc9b8ca759e35c2fbcb9743d178c57092075fc3c6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTAU2229208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40574c1dd52c4ee775dcad389564866e343c4b26bd809409b2116b736a50179e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFF2355689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1dca57433d3b597ab50f608c13bb64e9f19343af9f0c799687f96dd5276325. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZWFM2339689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea879fb32851c4cb281b01654d96e7c66954693dbff8386c4bf3dcb2c2b288b1. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZWFF2355691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16b379bd2f87dfec778f95fd5ea26a18d18a7a382589d775a944ec417811394. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN42241383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb3a118c74a1cceb2d3aa75b44733a598fe1bfd9ca795241cda5edd62afe78f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZDFP1948473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ad8aaadb2ccb78c754cbaabc9d9832499732e91292fe29153005c93493694d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNWR2185124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56273823b2c870f98a5e652d59f71877a00f8c39485bd60b1916bfbb07d78109. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USA2P2416162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a45ce9c62bdd35ac8e6e9effb0cc49c48335b0720a5700a32c36a2dc7d44b79. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QZDA82144474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8b9bcd80ba8961a6ac6e7cb31a56999a3df8d0f1256610ce81854f401cac45. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZDA72048252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3964314e3b1629c746e14fda76b2462244a58716fe526a8c8ec43b5affaf02. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZDA72048253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b59c39d03be21eff32378ac22f11730f184d19633bd0df8821d288a447ed26. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZDA72048254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3295dbffea72877e4be1ef06484182310f201328d8a0dd8b3ecf4cfe6f1dcb64. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZDQH1831535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6145d041cd6641226ca69314336e944af9eb3a3d37cb4d63042057f4bd37726. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZDQH1831536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14dcd47d5564c936e108fec464ba054faf0f5cc299f9bbb57152a00958d530f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDQH1831538.