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 0x11292d19235a27756993c459f0c326774689b219840e16b7d3b1014409c9196c. 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/0b1e2ef7-b543-4502-8137-35cde21056bc.json and https://artists.proofprofile.net/proofs/artist/0b1e2ef7-b543-4502-8137-35cde21056bc.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 0x0ba4ed80d679b6e1d06e32e56b045eae35a9b6ace60dfaadf360738d6fb2d28b. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:44:22Z), 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/QZDA72038546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf780d8510a060b5230302df53f0bfed59666ac7ef3af83bc41838f4cded392d9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA72043224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1570d2ce937e1093eeb9dfd4b82e0857ee0193e4184e1a7512f94289e82df8c. 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/QZDA72038550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a2ddac8e5611714e811a5b5fb6f4e471bcc3bb1252c4e9ea8e57ad958ff983. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHN92075256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d20873f2dedf245f710474ffb64e756d6af06958af91dff1dc9436cd0614fd. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZK6L2044820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145d673acc2f26fa26b25db46f72d5f607bd6a07aaa47c76ee548714a4ff7164. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6L2082691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9b2260df56c2382ebab8668356633c06ae0249652e13f79c826e4ab6c2a007. 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/QZHNA2240443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39c905df3eb2c14f6f76f40b38bd894937ca615ede67f3e3bf94d5539ed50dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6L2288246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe93b802ad3fad71c076435b40ca745c3069d3589261ba0598894f26d3ac3c55. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZMEM2283329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcc2d4084349fa59ac7a1a6bce7ac9e1a9e604f48a74f37708d705597b97213. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTAZ2270321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0b39cd4376bd213d6ee6f886047e5f3814b987ca2c3544d9bdc08c1a144f59. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES75E2300513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a52fea7e1215487177b4e7dc57c5fcc1798f7830068aede99b18e59e8650e7. 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/QZWFL2324225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6099d6560a8f2a5c14582ba5c1304482b57995022b189cdc63a3fbab75c909. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZMEQ2471217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79554bfe3f7a7a76425981b5c1684476234627a03b1e1d3db92b773ef29236e0. 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/QZHN82592383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5235d98f6106c717e5aeb05a0d06914a85d22a80cdcbbc037d6b7afe2139ade0. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZPLR2595781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f64ce975f1fdd3f3e3af85c2e7634882c39775721876207915546d5a898c506. 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/QZZ772555856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a6fff33df227de529def8b5671ce9c5edbb3c1d636371d099b05cb2aa2bb0a. 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/QZMHP2429089.