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 0x51a351cf72ea40a72824ac04174bb2915800acc4093ce6c9fc8f8e2e319f36f5. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/493b4408-1526-4714-b995-6a8e20e2ad86.json and https://artists.proofprofile.net/proofs/artist/493b4408-1526-4714-b995-6a8e20e2ad86.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 0x559b6fdccc2b852d2957d47115057ae89ab0b5cced174161c3b21e4aaf2af1d3. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZK6G2409518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaef8bebfc9189738baa30b464728543d16f0003e6b9e21b3315acafdc140e4. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZHN62466816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b07ae024de28213282c773900ec8aa21898b018a03cc519c6b2c7a01154c638. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZHN62465266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a7e87452904cced50b865aa92d0e2e712d59be3b1497d8e449d53008716a97. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/QZDA62420188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7eba98295a9dab0f909292dffe396066c2c1362952dbddf9bc45d92f0c840af. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZKDK2225865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44a1dba339dae4e67182d8d1985ec92f97c26dcc80bbb7e238329a75dfdecd5. 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/QZNMZ2362974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ef0b3f030de19e6838cc4e77f9b8dbb9150b4025f5d159d391db966f50f4be. 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/QZS672206128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801beedfa43a6df751482b83acad5d785490fa54f5c1c02938d20651ad18beda. 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/QZTBB2388331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33106027d2c8b3a0fb14a6d07d7cbe95a1b05bc0d2f9cb4c76257fe1d8f32231. 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/QZS632366439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36650e297ce45b7ce5f5ed6178ab297fc1c5e613a4d6e286ad303ed8c8b30e42. 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/QZTB22393922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ccd677f79f8f708732954bf86611c292fffc92f3d78410b42ca4c35e8cc46d. 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/QZMHL2353569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc134a409cdb3c79139d939610bfd87e82d5843ee27f880cbb9f62fa8fe4b41ff. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USLD91749551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a77c6cbc8409b545aabaed449eee1f27035f9c0d52dd8399520f77eaea05d23. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZRP52300192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71dacd558ce0949c5bb598d37739ea0902f868bb23e29d310fb0c553e888777. 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/QZNWX2368160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d8a6f4ed981b98a9f1461681beb6bd6386e5a472612c17bee7e3478c62464a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USLD91748169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952c2fee51f981d1475c337e20d90dcbcd543968e9c9b61b48142e88a5cb5f52. 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/QZMER2304934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535ec5975b347119cc610b2af461c9283f910c6bdeb742e46736c417219c60a9. 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/USLD91745545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24f3cbd896481d9b2256c1597f27ea03bfcc6415377963eeb71b88658428835. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZHN42307156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08f59e6dfffb2474a8f60591524124efc61806453bf68d60ec7eb7673e2e841. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZTAY2237921.