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 0xcfde2ae911515a6817f0c020ee3ac8e817fa4c05d83001ffce691bd495dcefca. 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/09e42d4c-ee35-45e0-98f6-f13dc17e3f97.json and https://artists.proofprofile.net/proofs/artist/09e42d4c-ee35-45e0-98f6-f13dc17e3f97.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 0x635014b2238eaa8721f8adfe523529b715dbecbce035dfbde637118a855136f2. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:16:54Z), 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/TCADT1801644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771b7e9fa36971294d3310c8a258d5d3d741164f63deb8911802ca90afb42172. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAES2013706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca72dde7b910660a96e2bd2c3b07378082e7269e5963bafc7a103bf95b60391. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:09:22Z), 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/TCAES2013714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10c85a3488b763892378cd3e22637fd05b7c080c5bac12dda6303cacb3355c9. 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/TCAES2013731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e639268d2a27d702d1a2396d7c68ac46b9468e19a38dc3ee4278cd631039d90. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAFS2127287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1905b46b89c99bbefe1d4efaa4e7ace27cc11e1e3111a676a92ca54a204b3be2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAFT2142001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c40641ff4a1b4a44ab0d46003000349a8e5285906df415ab6779f14e9a1e9e2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAFT2142011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398b499645d62630d85e827a4dbe14cc96addb363a101b289d6f2e48cda80932. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:17:19Z), 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/QZRYY2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9887eb669066b3b22c1bea8e825eab199e0553be6b3b53e29c7881887a08b7a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USBAE2296718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e2ae7d31b61166d43b61d7fdd3a0838a3aa64d66c2916cc9b76b233410d5fe. 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/USBAE2397292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ab4a6b25fb097b711f8dbe4ff7c221fc881c8e7e8754bbaf2e0810a181967c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USBAE2397504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea677d9cf7ad06ba07ce7e61eeac2667020097a50639421b686af1f47aeaf5d3. 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/USBAE2497884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0767e05f2f2fba1b9ac41d66111b27b1f1be84f262807ee762fca42e11b74d5. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USBAE2497921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ca3e5e804136d633ebbf62945da0c1249857eba2d295b553c7e5fb6064d8c4. 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/USBAE2497962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8003e38d555b3dabbfc91ef596ee8562c51a95d67747cc81b813b0b9368713. 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/USBAE2497966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc70e772dadce2d7d9164304a02d8c22b852c474e6f2dd924c519735cad8652. 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/USBAE2497964.