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 0x866780ff16322dc8f8db9ac4b900dc888928bb766eb68e3ea68708465d34099a. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e91644ff-12ed-41e5-b22e-2d7c465c4c63.json and https://artists.proofprofile.net/proofs/artist/e91644ff-12ed-41e5-b22e-2d7c465c4c63.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 0x576eee54d78702474be7b02ebf83b6d10d6128e37aaf6833a358c2db47c41aa3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT6E62502721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c19f7e4f1e02fe421d75fc61ebf9f253be774f2b8e6295e3f175107ecc93f8e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT6E72530910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301ed94cdafdc816b57207abb0359dfe6e30807a80fde1dbeee2698aa7574bec. 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/QT6E72523134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedac18aa63ce1d1e60b1cb40872dbcc8975059dacccb7155ca22c3de7a0669aa. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6E72526321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2cdf00521b2f8282b5151fe51f4bae5ccc13629b1ba8701e0d2fa05e0fee28. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QT6E72530912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772b17415228d910623dc188d6f8da8855db9bdde227dd2a4cae263af12d6f5d. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT6E92568952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ca57a6041eeeb2ba5a9c04093e867d96d5fe2fb25298762517bf615b1ca22f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6E92564820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8640ff1b621aa32e37a7b665d67e562d7a6c4bf1111a6085454bbbb57635f2. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QT6E92555712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681ee86248561d6484be1d7a5b52b2fa4d4fde32e5cd213a829815b0094ea8bc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT6EB2504982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8472f376c192c9fd2a7930d74d47a1209369c3ca22d1935f7b77075069c954c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT6EB2501196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7634f938bdc49507912493ed9e5e701dbc328a21cbdfa7ae6b9cb5977f1f7a8e. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QT6EC2559033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9a022cad886f36179072dfbbedc9a2815875c68e27b275218335cd63dab6fe. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6EC2580100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3114ad42062675ce42287dffd64d0ceff235b949e83b12a7dde026b57a06028. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT6EC2576997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50498ad716dcb3e60842b77d1369ec7a657cd030a01e78f9d9fb7fed570669c6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT6EC2559031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9e10b758f6bcbf6c940300ee26921747624e25c91ba8a219c213549bed0e58. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QT6ED2560008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf9a98283d2c9553344efe2259889f028214198f0529df393fd23fed5ef7129. 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/QT6ED2560011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b60952b0a52387c9c8bc01871b45505d78957f585c5634cfb5664a43f69aac. 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/QT6ED2555873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5512da11b0722305d56a2b2a1d494b086b9a7f4c9b3a485acedcc9136373d8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QT6ED2559996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed1b249ba393302aaaed121986011bc589cc5e251dd0ec37b5828e602bb0353. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT6EE2542382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc221d05e86d24482622a42ec8e67d2b7481f68326c8b640b7b6ec9a90724a1ed. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6EE2533262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b371ba1f3a2f9c5527287f8a36fed17c57ae706d9cb038efe89211ce61fea8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QT6EE2542384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4582d99fb2286673566f6119dade6badadbc934c5b47cd8d5e998efd2477df9d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6EE2546053.