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 0x9ccf599288e66cac70e5408e655ab0d67c138b214dbbcf2c7ed8e911d1590a7e. 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/cf5bdd6f-d02b-4925-b497-e32afb84d588.json and https://artists.proofprofile.net/proofs/artist/cf5bdd6f-d02b-4925-b497-e32afb84d588.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 0x1f61eb8334efa0eb5d9590d94dac352dcd6a6f661ec5be9855d26b2f265452b8. 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/QZFZ71911191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf977e0c9b91c82a5265e64551a33e40bf9526f519da4002a58a3e7de24759e31. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCACR1632961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af0d93ea5ca2bda2fd4065ffc4d1e844266a435174a8efecf498ab40fc0b3d0. 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/TCACR1632976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195e786a2396c56b07579f1e78e52e6acec1989ff264f20306a8bf19f1ee5583. 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/TCACR1632977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7583935aa25156f386cb5497e9d7ee371b34bf0c7b482a353683cece29dd5b2. 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/TCACR1632978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f5a39252789da47fa999bdda681c3680e21adad9b20346e7e11046a7b5027c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCADL1888583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0927161056e9e82c6b863334928cb84a5d873e1b707ddbe88feb41f2a7e2582. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCADK1774661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae670474125b772cc06b56fef45867a2fd3cdc31c13cab11103fdad505750b4a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCADK1774641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeafe833100a21461d9dee4ac23c57a6696259b8cb6694f58f42031e5aa5ebd7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFZ72045378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0414b04227f0f9569950729419ff56264d1640382fee6d475b68a4f0402bc20c. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/QZHNA2099740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b94a7d4418f5efa78d31475bb053e0ca9f521c917ca71259e3b20c27191e31. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHNC2182503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d02f19d2af62389398c6c577be211fcbb3468626f0b381437fdf584d7068542. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWU2199867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc660e3f3f6a1e539d5a8c3b807e1d47b71ba982dd41a79137f6e8da9d65a7edb. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZRP52104335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3defed01964e328c58096c209c38925657f7c5941c3a3596b76246280331c7f. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZFZ42263395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d4c2dbdcbf0e94972dc14ece313e201243f8a1ab4fdf2b1e4ad3e1e3bbd9dc. 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/QZRP42233385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bd8f1b6937bdb9ebeca650527caf0c1da1a73407f7312294eb3d7c1b17d64b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZRP42463719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2112699fd39ee1cfd5e96dcbc638c47163c81dc8553319e821e1d652fc05754. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/TCAER2074900.