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 0xa9680a7e992e599029b1878f0b91b9996a9df28d9132d44acccc16d28a4c0a1b. 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/b2845e6f-4ad3-4063-b011-ad5c131667c3.json and https://artists.proofprofile.net/proofs/artist/b2845e6f-4ad3-4063-b011-ad5c131667c3.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 0x49f36abefdacde7c84e4e433167b1d5017dbb834e22bd15cdd7f2f2afb90c406. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/NL4WT2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea6367a61117542f8d0c4d2da340aa4783eb4030da90122454672ca5f84381a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/NL4WT2200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4669c116bfe27e216492ceb17efd9bcada706adab4b057e9de4aa4608d0ff62. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/NL4WT2200134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40980ebb4bf83d474e8f2a456dc0428921d731974465dbe8c3f79d7ee3d0cba. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NL4WT2200164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a8c1e20f032067ef42882d8b17e923e3c9a45694dd9fa85b1103cd4481ac88. 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/NL4WT2300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe512a73d3dc63331a807b91d79dd5d396ee40c36db7d3e231c32fe3a5bce0f8c. 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/NL4WT2500133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef28451e9b8bfd1770292aaa93d1e7a79b34d98eac5b020905d0fc4ed75a622. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NL4WT2500218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259f372824c1040ac622457b8b08720f9475c95a0c40e2f7d90eca4340f464bc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAR42071977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5412f3ee17443aaecfd74c66042fbfbd9f611a22251b461fb1333e0757fcad50. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEAR42078819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fe6ce56447288e7e92fff1cf6f3e36d569f78a055ed3f0bc2241eab330e6cd. 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/DEAR42027868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956f61107fbd982b80b822d518d6a9996d932fda9dfded83e3dc6b3d2e66426d. 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/DEAR42054028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e87419930b5ffc8847a428dc5165137bcf6d4e5b30cab06654c18d419e6930. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEAR42074055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79893a59061caf926a36ca934f67068fe9b1ad6a235970dfe40fe4e6819a6bf5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEAR42044949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055e91dc802c96b5e2c8bde6cee320d0c905103c3fb787f4b6344630390695d7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEAR42044202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9502b4ebc013bf2ae0b7cdd6e997f80227fc69dadd678c309eb9cf87562f918b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEAR42039694.