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 0x1a35dadac39a7e0ac979de6022708b479b1776e73de4f63c3fb521f6db80a064. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ffcd2043-6a37-480e-b4d8-c7602cc85eb1.json and https://artists.proofprofile.net/proofs/artist/ffcd2043-6a37-480e-b4d8-c7602cc85eb1.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 0x7b5d609fe19496db5f4154e32ce6cb2f4064741fcc05851b86dc2e5b2bd7409d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHNC2593079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc0da4e25a8ec439a07c3fad23e694a49dfd388e6f17156694038d2b0c641e9. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHNC2596756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a50e4f4549279bbde44230fc70abd7c14751fbd49b81d07db9e6423a973fbe. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHNC2594788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03175d33098dea8a8a5f4bdce92b1df77ec47f44ac292a7fe3f354f90b0f44e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZK6L2591678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbc8cb7d0cd0efb7d87d172b9c8c294b517ddd671a3be28a2fb8a59493429ad. 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/QZPLS2592373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9b090018735a13fc65322aff9e1ab0b24dd4f515ebb63526e09746a02ea8db. 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/QZTB82569622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f8fcf85ef9eb160f6aa4c49851915e8e7bcb223be7e66389c7a41b1640e7cf. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBC2596300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5669e9ee96d5af299af81f467935422ff3e13ce52329b6f4edf774bc9460ca67. 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/QT3EY2521195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7249bc4641499aa88a616971af9aa04a885db7054c87fa5c0d844b24c27dfacc. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT3FB2548857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd00d4f083f5169caacb2dd9a476e15c05d9954acd2479ea83a00285659f2ab. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3FB2548763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea994feb6648aa3757608a749b6c093493dff599914382a8f062881c6535237f. 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/QT3FB2551383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ad999503dcbc6dc32edbb21876c71a9a53078393afe2abb777b8b54387deee. 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/QT3FB2548752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed74036eaba405f71dae1ac7c94a002f7c35f8e389ce64e37563ff58029f34c. 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/QT3FB2548753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7e4bcb40d325b6885a83f5bf208b2e1ad5180d0ec66fb026fe1b1ad3b0ff59. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/SE6XW2276958.