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 0x37a6184fb9f476c5a131e89fd4e49b2917ded7c7fc200b0e2150536d00da5e20. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/549d2081-5e8d-4803-8360-e995e7d88d4f.json and https://artists.proofprofile.net/proofs/artist/549d2081-5e8d-4803-8360-e995e7d88d4f.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 0xe03ba390c70424d89b41fc8388970ad7d7c016344295b7c5f38eeabc6fd2de3d. 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/NOHMA0576010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03ba390c70424d89b41fc8388970ad7d7c016344295b7c5f38eeabc6fd2de3d. 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/NOHMA0576010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ff8bea22d6b51cffa02a00c60699eaafceecde8d1fa9b38b8e2294e570fc21. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NOHMA0576020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b90280d952ad74904dea4962d4a3fc6da2ecc717304645578ea8d7627f02e1b. 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/NOHMA0576030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7fdb8b69ac4c39ac922a0a8c90349da5127fbbdf94ac95e9d60680e3f824e01. 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/NOHMA0576040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6e74d24d9bb7d5583e628fb420b52b69a63b3a8a1e0a7c3d772a90200e8cf2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NOHMA0576050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d258a7c9d4fc810ca45c4a3039dfdcb0bd2d2a235a275eaef7520f1b760e9a9. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOHMA0576060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8f57762a8ae673966f262528d59ef1e6b773cb59406207513891c54b5d1210. 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/NOHMA0576070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3157f2e0f82c39725f46c77f512d57954844ef995cc8487ee9066ab7d9199602. 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/NOHMA0576080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b2f74c46e058da76e88c6808ed3de899952db35dae31ce4951b0bc11e4e28c. 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/NOHMA0576090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2f2781c3d49bfcc318b67866f35974bdbac38848afcee3673a0649fb99d420. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NOHMA0576100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4d53bd40dd2d7083e416aeaeb55f7fa51b0f752145bf583733b20d15d8e5bc. 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/NOHMA0576110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440e7551c2022c594af9f17a3b21e37c7d8c63139d97ba9e1425a4034c68b9db. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NOHMA0576120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7537e7f5ea269ad06f4ca55b9bcdc8f28d4634471d961ccbb32fbcade9e72da2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NOHMA0576130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ebe6c2234157233529efb7d929fe78e858d0073a5b0f4e526d8f6b99bfa04e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NOHMA0576140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3cd99f7c75379bfec31e336cdf5d22f23ff548ed62b67b5de0ea19f77af61f. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/NOHMA0576150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0dedaa1b58941d7e6de892e0a59626cc15931357f05b67c5776db31890348a6. 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/NOHMA0576160.