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 0x9c9084c8720e37da1a7250e1081123b22fbba85e371000b9e22aa61345ad80cd. 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/32d61b7c-6cb1-4949-b8fb-7a2bd48b6132.json and https://artists.proofprofile.net/proofs/artist/32d61b7c-6cb1-4949-b8fb-7a2bd48b6132.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 0x5cbe795588c55b008849e970eb665d271e3d868442855895c26237b4c83613a8. 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/QZNMU2201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083254c24e7f4f5233395d0b841196fef7be09fc6398d634e1bd7c99f8977f55. 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/QZNMX2204819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88a672731abdb567de3f5a0553f5818fe74560fac6a2f9284b59fbd2f7446f6. 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/QZTB42211586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d328fa9f29c0338d14bae8cfc3f298be1f34318092cf871532a63553e055ec. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTBB2255839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a917bb5a66d073416ea184f7c2f76bccaff00132ca77593ecf6aed4a91c3a7. 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/QZFZ22343043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9361140b0bf647157b524e6fce2cfefab148d103aa40d0bfad877401a90065. 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/QZES62362323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b82d193774590b19bd6640e8d7adc4f6430aa2c6a69ac39c380974ab30c587. 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/QZES72376769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58dbf41ecbcb8d8f2b4b9eed0311b2f48bf5cfa5acb7048c106a9f804de86431. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6J2318719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85527642625208be9298b9c787dc90e799f7aa154cef5b457b8a05177f58651f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWQ2345201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329d5734ecdfec0630cdfe761b121c9c5f683d70675825243b5a5955c1b29309. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWU2338680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d22912cd9e436349ed44a8ec38a0d2bbbeea96d219962acee3809a48afec33f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZPLS2333156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8339f5b552825facf678962eabb033aed275c259004a4fbf71339be23d7c124e. 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/QZNJZ2390459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd44e8122289f223f6d1c2d02e34ff481784742dadddf5b8c19cc82a9e620728. 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/QZTAY2386424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d898f51bd0921dfabba904a14dc757abfda4db569a486356db9bcd5f8a8d1e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTB72330436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3120af2f911ccc5b4ce22fb7f7a3fd797f743da520fa3fe9499702c1673f59. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTBB2396472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6037f5167575362b02f91b86424b32d37ddbd9724e87e75ca98ad6901f8b19f3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMWW2403127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3e92114b53c1b87e172b5b021d0499c2c40bd0e10c31246418776314383afb. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTAW2427470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac374bd682c06e79b0c4980ec023b4a3128d9942ec9e2932fe1edeb38d9121a. 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/QZTAY2434973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b15d5c9319c141e3c57fd0f8f3e49b356ea07f8df7e39ac3f2acd6a9dcde9a8. 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/QZWFK2432737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4227ae9477c550c1b912370a306e3f4cc2118fbdc00cc56871587c58a765e8a9. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZWFQ2469440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4924c9ffa640958b6428afe68efe67f1b3cda3807b5fd083dcb127879fb3c943. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZWFP2452806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329a0274979e6dd79a25673460db49056bf73ee5235405dab81e170316e69e89. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/QZWFT2439059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb80d4941c4492b7d41aca13038e98a899ef737230a5f6a63aa097627544473. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZZ7K2437743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a9f49bdda7a4568fb9ad5ce25b57d4beb71f32d03c1a83185bc71b859a5edf. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QT3EY2487879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6229d3a1b48cd9f011e48acb2b200ee865558510ed5330c6ad93ed85407966a4. 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/QT3EY2489593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23140ead51d4022efdb60486b674c9aca982f99203542a502ea11f389f8ae7c1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CH7819577352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb916377027dc853d7c58907f371955dcd4dbc7e3fca19bd76daf12fc44b1dff8. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZA742524240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cb390422f5a3770e3c6c8c1af438424b5a20d92dc2486bf78f16b538e7e18a. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZA742524243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e33d2f425a949b1938880c3f50a22bbed8103013e41e64834cd9f8c049859d. 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/QZA742524244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e737747bd9f10c16bbb702bee8b2358b868179acb8a9fcd269c75b3823bbb13. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZA742524245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ca1da7f9e2ef012cff536a425c2092c8f08588ab661b2516be9886af83e8e5. 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/QZA742524247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4209c084a083c9c3d05f7328fef196e89ac060fadfd8e3271614418210d75c84. 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/QZA742524249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fbf8a2e99194b89ade54c5e4a21545bbe7e0df4d49cdc563c45b30f7fb178c. 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/QZA742524250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f175879a1d60eb0e903a7b241e4228575616cb091a92b83beeec490528d7ed. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6K2507235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0e88793e3224f9dccfce9b1391b5f4ddc41acdc35df2cbaf68dbdc19a963ff. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZTGW2405510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eed39dd0be4205f370db20cbc7f349018f8e225b6505ab24b9e9ff69cc34de6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTGW2405511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db9c547949cb25cf3f6fe20a9006c0819e78644fb309e6f03b0d94e8c415177. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTGW2405517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948024893f7732dd1d5538727e22bc276a929ba1d2a549b2597a3bc856e5d36c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFV2526783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461becca89b7058bc458ca49c356b2aa909373a547e62acf7c217d4a39f1a7be. 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/QZWFX2567171.