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 0xdc834960e29acec90e9cd7831534079b50c13da2f95a3d125110788bdd6ea687. 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/1758a1b1-9aef-4aa3-b661-8395a4abb097.json and https://artists.proofprofile.net/proofs/artist/1758a1b1-9aef-4aa3-b661-8395a4abb097.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 0xfc54d0a7031df9834c1d1f0919032b4f5e32e9a470b15392645800c9026ffaf0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZDA82037465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b741acff963de4f2899e96185a3da3432aee82aab9aca878afb786db03acdee. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/PT4LM2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc232ef62949c7c0bbeda2911693167b5ede3774a11a7216f497f14404ee42634. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/PT4LM2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0268941ca702aa74e7faedd9a539c574226ef723c71e4b105f5e29bfd655790d. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/PT4LM2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50dc0ca6a37d68f0a9c560b6c0cd05c7b317e9fabff66af671a774683ceb87f. 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/PT4LM2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5148dd5ad0629d8519ed0a2e37f5983d381a1d4545db58aff56524ce3a1a1ee2. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/PT4LM2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd529ae71769a511599208496064c95c3ea670f7d7d0429b1558443c7b0bcf34e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PT4LM2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367921946679d754ac7cb02fb9955102da83bef7b2635b592808345fad0d59b7. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/PT4LM2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01ef11c28adb5784eaa681106cff1087f9d08d5684f1685d206ea3745315a7b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/PT4LM2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84caef0a0b67f488d364e4b414051e6b269a29a1c8dd2e55d25eda30453653b9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/PT4LM2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30ceb2d13c97f321efddca31898fa7ef76d95737e3027c6353cc292441ce3cf. 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/PT4LM2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af3babd507879a3c6e24544258f17050c12427e5da831ba3531e3471fd0a13b. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/PT4LM2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40716ee42c6121fc73d80b95ab01f19ab053d301165ad54e1d155eddc452da7. 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/PT4LM2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0385bdfd5dfdba8762f54822738e593cd2cf85c2b388a3f87c0cf9993416b3c9. 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/PT4LM2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404a7cc2f919468f17b5c1ee3be9370c13749e9689079c3b5b30cbc3f8819542. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/PT4LM2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc775a7eaf64ba8b473f2d66ffefb919d7789c4caae94912eb801ca86ca1a9fea. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/PT4LM2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1a8fcbf2edd065cc9da6624632d5a98be987ff3b172cdf7b74788e84fe67b3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PTUM72400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eec0d9547a07dc9605cb5a359d00a551368881fa10a61dcff18145d01ae508e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PTUM72400214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eec0d9547a07dc9605cb5a359d00a551368881fa10a61dcff18145d01ae508e. 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/PTUM72400214.