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 0xa8df069e98e602b5a1f8b3209ea1dc198d2c7c28a6a74eb3158f1bc9863db350. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57e88fdc-f5ac-41c1-b93e-7bc4b5556f2b.json and https://artists.proofprofile.net/proofs/artist/57e88fdc-f5ac-41c1-b93e-7bc4b5556f2b.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 0xdd22d0f9a377ec95f527581546b41e97a403798dc1bbeba2a9ea8d187f18635b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US7VG1778941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2646abfe193129022ef4572571cc6895400d56dfdc8b4cdaf19de537d3a385b1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US7VG1778942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f1d7d0c20a76bb7a925aca39d3f4fc6e2466ea26e163f707bd1d218a0a2fc2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US7VG1778944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46d45a335a6501bcaa1a884db6d01a0c6c255e7ddc47b66ef64d6b7c3c63d57. 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/US7VG1778946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033fac12f3bfa5ff1ae9a21606c58f9d2172b1cbb39ba536b27d5c701ae4da3f. 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/US7VG1778947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a100bff481805f8e754f59dc79d4cd2c4828ab7e256fe1156429a36cac79de9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US7VG1778948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6f97442be737b3d6d4974e7ab71cd88484c370c9412a2d81e3db674daa780e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US7VG1778949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ec6ea0b52e1cfeaa59ce3ea8b142cdd69eb8e71d0859f2f8b2cc5d8d066f33. 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/US7VG1778950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a26b3da0617afb2bd78b9be9ba529dbe16a91e75a0c582ac1719e2b98e1455. 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/QZ5AB1966648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f8447769517a3871d928b72e1a2af1fc538445e256e7065ea7013fa9cb9827. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZ5AB1966649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ec047518a2f44ae3605803f0c9c93aafd177f27711c93808115b355bdf1cf5. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZ5AB1966650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfb44679f75d81137638c58e34b2a0a9f37099b52223bbd46b0088d20ab65e6. 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/QZ5AB1966651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5634ed86e982a7e9727f22b95425328f699decbeafae29927f13b9cbd23d010. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZ5AB1966652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7b0e568d737e12ce03b0e00c2de3bb60237848446880d14320fa2903d6e885. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZ5AB1966653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dedfe470711f8535e8cadb89384d74f997ffbcf598ff63efd9922a4bdd736c. 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/BXMB21900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe617227db40eb212af0bbc2a764d1ec96157917e13a991d7d5aa3e6ca1aac0. 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/BXDG32400004.