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 0x4e60cb6b19f60d1394c8d03c76456cad0c69d4c1cbaf749b46e7f92da98f7c1a. 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/7e09178c-7127-4c6c-aabc-1511e4478d27.json and https://artists.proofprofile.net/proofs/artist/7e09178c-7127-4c6c-aabc-1511e4478d27.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 0xd8869e8cf2fc64528809ff456f83e21aa5501df887ce6b27c7619a37d470c99a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USQY51753532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e86a333f7e53f9dc38feb7a96f9778585597bc713c27293280edf1739eda36. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/USQY51753537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b64ebac733438f5bfa102d9eb0cb47f87f77925118b73e52ff3a4e1c8fc3c2. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T12:02:19Z), 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/USQY51753536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc851462288e5f74b42f1525c2936126808d4a3c891979a2a06db5d77e5b7b436. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USQY51753534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4b54761de8e7ede5fb66aa81adaee4db4cc126f07d333ecc70f5ded222a6fa. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:38:43Z), 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/USQY51753533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5253e7db6be0781548387657338240fa416e79868ce2eacf74cd34e3f4706987. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USA2P2123196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026876c6703f8262a83397ffe57b5682e8d0201b860205d4b5266c1a1365183f. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/USA2P2123191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39dd2355d7d27dfecdd6332b61963f69b410aebf838ce098b9932970d2c2c3a. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USA2P2123194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4aafdd34054792f0c22eb558f7ccdc6c6e2fa7bf420028997b259e4015ad89c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USA2P2123197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637f2444817d3eec43440f26ff7ab3fd28821382e821765d9b15a4019854e0e9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2P2123195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91d140a90e3df42f58d9a81296211eb03c82639ae4b278b327b97223d85dce5. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QMDA72318199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35da685d5f17fb809947a32bc36f5e8ecaa53833a2efeb1960a9968d453f57f. 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/QMDA72318200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45447afc0b3223771b46cd7ac8524284cfb9c7671da10ebfc6aa73eda031de2d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:50:21Z), 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/QM6N22480382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbff7d66b438202049cb12fbb2074644890f18d8781846bc23670679d85b902. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QM6N22480378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45447afc0b3223771b46cd7ac8524284cfb9c7671da10ebfc6aa73eda031de2d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM6N22480382.