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 0x9562e4ac5c4e7200358929f2e50a2f6281deba9f6682e7dc1f2f9f1fcacfb933. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/693ab786-2fc9-465d-96b0-cede23f93ad7.json and https://artists.proofprofile.net/proofs/artist/693ab786-2fc9-465d-96b0-cede23f93ad7.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 0xa6867a4318aa1a0a4480a505b8bd3010c77ca818d0633b7ca0c92fd38b98bfd3. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/UK2D51700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f8bcfd2f84a77d58a5efe948c28b8dbd026b22a5fe16d70a611fdd7687ecf8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UK2D51700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082015adb6327ca3e7eb0ff7e8a5e63fc6cd2a04afadfc5e69016b9a6a3e3cb3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UK2D51700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2335ae502bbe64bc9fc5842fc978eb19cf69c5a5e49acad1c7766d49f43856. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UK2D51700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9390059d5b20a3ca3e08cdf3e9b9ea98d013e54047669133fde5d0628ab102f2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UK2D51700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f9e4ba52e623f03ba23d3b044bd590fea1428bc8b9be7f5dcbbc02ca941963. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UK2D51700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c641994ec272c626c6ad72e8704428db09c71c1f7517151c1294998784d2e9d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UK2D51700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99e73c9a588a8187fb8093d072104670b1763c5937aaff21520d1b86fd16643. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/UK2D51700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726fb723dc887e6f1d3c3cc517ee1e1d374684b98303efb22048ca1eb7bc8077. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2247745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082015adb6327ca3e7eb0ff7e8a5e63fc6cd2a04afadfc5e69016b9a6a3e3cb3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/UK2D51700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f8bcfd2f84a77d58a5efe948c28b8dbd026b22a5fe16d70a611fdd7687ecf8. 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/UK2D51700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f9e4ba52e623f03ba23d3b044bd590fea1428bc8b9be7f5dcbbc02ca941963. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UK2D51700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3dd2158f847071ead539f27ea1220bb8b7ff40bf549aab3bb89e05d15b5576. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/UK2D51700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc17f64a339679ff02d5f298cbbcdde7163206b1ffb65e3d2a2daf7eb00cf6f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/UK2D51700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7989af0cb74d7362cd9f73d22d6ddc0b45675b9b337b9f046178ab1921d064a. 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/UK2D51700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc49c87b590274888a34c3923ceb545aa25921ead915b82b8ec3d97468d6813a. 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/UK2D51700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc03493937c191947a93e71649cbb7fb1f11c2172a6cff2e21b4cbddcd64efb9. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/UK2D51700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f09d99ac0a913d6c81dc801122b08e9e91af2ec686fbbf793083fb87488a7f5. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/SEYOK1202770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb59f316feb820b5141135f67a3d29f10a6150f5878c80be2301d3db1176e9f1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEYOK1202771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bcfcb790d48a7cb2308edfd1eb1f4d75bd02d36661d8ba71ec7914e75c9c5f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEYOK1202772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aa67b2763d3f60c724aedcbaef2a0531946e7e7db5a6a49193845ecb72723b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SEYOK1202773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75167c3fe6f634c0cf79806bdfa4a9c657691a5acd384b28cc3d19f7e13e516b. 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/SEYOK1202774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250a41b02830aea343e4378627bf798b57ad680cdafe2a6c7e41fb23c7b058a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMMUK1900168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf638054221275937a9279524754eee1b4b70187a612a396c6ec57130231418bd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMMUK1900215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5aea2d3a527d55df55c254989bd2414a76732120af77214742f9da010c7ed. 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/QMMUK1900216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a1ce4a75704f06d9b3035c04d2c806ecd2a804e75ffebf037b2f8db3c13daa. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QMMUK1900218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfae8d86e69a96d223c51c13aaed73bf7002cf2a7d501fba41b2091fda33422. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QMMUK1900220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc556c78478fee883c5635428ca1fc24ec46281fda3de5a18ca9a452c8979711. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QMMUK1900221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5446009e9c9546e576bf809a3e0a70ccd62faee6a2fa0c419940af56adffc35d. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QMMUK1900222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc066cd95972a02aad424d9c2faae5a0951423641bc1ff420c9682c1889a54132. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QMMUK1900223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc066cd95972a02aad424d9c2faae5a0951423641bc1ff420c9682c1889a54132. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QMMUK1900223.