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 0x5a9d87ec6f352a503560a117d3178d19827b40566c9ca82fdc8f4280f32ec390. 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/af516902-6261-4b75-aae8-22f7c349b857.json and https://artists.proofprofile.net/proofs/artist/af516902-6261-4b75-aae8-22f7c349b857.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 0x4a47fe23d1c9ec309bd259e298c6c97e8636bfc944c34c1f1d0ce470b17bcf1b. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/US3DF1405517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c74758bf955ef491d317aec5d5b4a3c40973f4b2ea5d18163bdfac480e72f1. 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/US3DF1405525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd27743c5900ab7a899e844e4db77616f2649118de7a3c2783d5e1ca3bb4452c. 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/US3DF1405515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7e2822b3fb0f89d49ce318a5e46310f7551c5f66a58a3bee4af844868e049c. 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/US3DF1405514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd27743c5900ab7a899e844e4db77616f2649118de7a3c2783d5e1ca3bb4452c. 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/US3DF1405515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e862b90eeace5328e43e0044220ce1a543d88c8c98498264cb9616ec4cc148. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USJTQ0905073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea74fe077d79eb635cb030b6c7bb5be442763a3a903cdc6c125db5e27ebb8fa. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USJTQ0905076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e993ef089e5fc8a7492fa188bbf9b78c64e4e8a81589121cbe9c675cd5d90d6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USJTQ0905078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9fcce3de46a029912456198fb1ed7d986775c7106afb643baf2514b396e0ef. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USJTQ0905055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39375f8688a1b87440c35dd5f048cac1ca67716fbda387966373aa06ffa16f0d. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USJTQ0905056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7bb08127dee98ca0ec3e73fb6986e9ef1741a48a7da6fcec33744e949238e7. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USJTQ0905063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf4fb94dfb521b79aefbaf6c7d052a58bf19a5ef48f77609dc066fae9e0dfe7. 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/USJTQ0905068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e456d0aa0c686b6fe65d506ebf2945359cc3f7b4204f8bf8ba282978c0b0551. 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/USJTQ0905111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0729f1275f25c501eca62f2f04f024a14dd62b56d7a6bc215e99c1d5a80740. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QM4TW1736421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897378e45fbd22d82d2cccef92deab0cbc2ad5b37558b399912f6657afa67cfb. 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/QM4TX1768387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca239b01b039dc9b3c78198efce6d02e593268100129d4a19901fa69c8547e9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QM4TX1768388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59b98d19ad1201f43e88b54c26f228b1bb795b8f585c63a5a82d78f4b708124. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QM4TX1768389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5637440d12c8cea59c670b70f62c1348ab0c4a2c45b40840a671074b30c10dbb. 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/QMBZ91963623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4616168c12a5db345a5476e79f8e8ecf39f6e9da2541b43e5e317d18244cfe9. 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/QMBZ91963641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143f29c2212e33a6f0d2b2e7865ec493ef56155e6e61e08192b3ff6cd931803c. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QM6MZ2033577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a714678c4f3cac6078594c471383a81e22c6afdb3493309843b37a32679aff. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM6MZ2033759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4625fb15395d7e8d70328b8ec1c05b73467ef774aaa5821aea2d3772892ad3bc. 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/QM6MZ2035198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74c47c231b013f87e9f8a3d26dd52f73ba41975621ee57fdb222cf602504251. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US3DF1405532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98ef10e59f33bded48ae637c7ddc41ef1d326d0d7fea38177b7eef9c89c35cd. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/US3DF1405539.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb23b2be4465296737c6698dd7fcfa29faa111ba36b8dffcba239fd34420867. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/USL4Q2509037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249c0a4c97d6b923a263248afd086c1ca8654eaf44b70592191f86c46d569eba. 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/QZTB92505958.