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 0x678549d8c3562158b35cf379b495c6a7d411cac04c6ce98bb0a3ee6a932f8d0f. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09b2e489-e966-4fa3-9ab1-3b30277365b5.json and https://artists.proofprofile.net/proofs/artist/09b2e489-e966-4fa3-9ab1-3b30277365b5.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 0x1bd51b6e4c3e792a3ae9bae65f5c2c8861170dc360e3c77ffe4d7b7af7e59da8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNJV2116969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1899c8d2d3fbad635cb343d27fbd5c9b1e0c3077fe6d5c8dd124e16b422e47. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZNJV2116972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2e7450bb17f6393e16eac6f9e97a1b20a3607f70e776926535fe8d56e659cf. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZTRX2294091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc5b0e63bb29cff44e3f978591f9b0e402d244304b67f1e7046794d0b4ac58a. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZWDE2212470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576d6eeb5337fbcb6c4c3dcc4405bbb4f2a53b73e75583f1a34fd641553f7524. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZ5FN2356729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf728a05792d1117c15f610a52e8bef3b6edea723b422d397e9c26fbb450afc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BKNDN2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc29aa68cc22a9c8b2cd04f565acc9218190b5b55b4d71dd45d1f8bf7c7d641. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BKNDN2300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5ef4d1e970966b3bb681ee0efdef0dfd2cfcb509555da17a2db834f987640d. 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/BKNDN2300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8734aaab56373d842ebc6ae14974779a78e2ff1c0fa0c29a96fee05f2717af. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BKNDN2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa627c7c3df250e08ddbb1e7a4ad25afc4ba2909145631b95d84b260b1069e019. 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/BKNDN2300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d21698c8ce1288e9fe8eb870a6f522e65c5033d1d725a79c34f8866349233c6. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BKNDN2300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5888a2d9a2e8b0120570f4cc4243519118f7a200659ebf3296837651e96613. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BKNDN2300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d3b9d8bc771e87a29e4eaf5a1b75c54e920eb2ea1c9202e1d7f1b87dc6792c. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/BKNDN2300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14cd91b2fdc3ecc8fc711c7e0d5705b746a1b2305fcc988cfad416f58c9cdd2. 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/QZ5FN2433344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5228bf12fa553fa6cb02639b0133274048ed87364ab7f6da9ae3f18308a27b8a. 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/QZNJY2177114.