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 0xfc60445dc59a544984536b17c7b971e32898888e1d081b636c9fd2dab5d0c5b7. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da83435e-8d9a-4f33-a602-5fe5d251ce7c.json and https://artists.proofprofile.net/proofs/artist/da83435e-8d9a-4f33-a602-5fe5d251ce7c.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 0x9970f994bf6a64ea5cbd8bf183f2ed2752018da8604c3e3074ac73c7d903ab75. 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/QZFYZ2491926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba7a85ac686b4006c86264b2e3a0f7d6a1382d30473833f98bd13d6640a7996. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZTBF2323804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb43aa02aff536c99fadadbe4ffd7f513a5de5e4e895d8cf29550d67e9d72334. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZTB52339436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960cfdefa5beabe36c775a3c97af2771361ab9cfa30d419ed5816bb46304284a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN72426429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638019fae81cb94e311fdfe5a2c4289d17761c951463de7dded892e3a1c60853. 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/QZHN72426430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0200ea0612953eccc91ea78214c849640c97489decf228892c6d636da656995. 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/AUEVY2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca992e4f0cd220373e4db64204a23e305d858c8d0a829f75e7ea5d400bb25ab. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/AUEVY2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc454fcb84348e04a8961be4b14f0c32ed5acd54c0478731184cfa74b4f568577. 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/QZMER2197287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c971f6a6fca4fd5a99bb42a91137b7fac7af3f112a4a822ab3d13a6ed10a09. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZMER2197290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa23f24fe9238b91c107cb44aaf2505bb845d72b53349602d10496c887e01014. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMER2197291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950c449d8a82dda32c3b1f8d151e6a17ee39ad3d658227b25bc4063d0fd8117e. 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/QZNWT2004928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf6d65a551381d6975f419dc418a4d53581f997760cf8d6af868896b875512c. 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/AUGBT2406800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fae48981ac5cfd22b0b9273760ed03f65d6ead8f8ac3606b2f725169a083a3. 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/AUGBT2401824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9739827b02f10ca901f264325f9e801f61411344ca37d228e5cbceec6b60d38b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ72111451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94dae13ede9e89eac1acb6abc88aaf5dec15f4889d22b587641345cc86d0a0f. 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/AUEVY2300011.