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 0xff7288850588e923ccc542aece8066fc42912bff688c94daff97d6d10f7ccbf7. 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/0f9d3b7c-f3ff-4750-b0bd-7a829255d4d4.json and https://artists.proofprofile.net/proofs/artist/0f9d3b7c-f3ff-4750-b0bd-7a829255d4d4.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 0xeef4a45c29a6a2cd1f3c22324ecbfe04a54a5ffa0e0ebad22b9e667e654231c2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZS7J2201312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9507550eb61f0988414da7307af0f1f83e57969e1556dfffea1b8eb430ba17. 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/QZTL92495470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd9adec815ca155185189cea385ea1bdb60a5f7dc5895902c0e20946c9c4e1b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA0L2388044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d51f7419e10d96f54d144dfe7a53a62a7195c398852645134a6ef0f8aead396. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5AB2087264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5016ff233c8bd96427e88ece5b95d8d46ebbe60a53797aa6f77a687f3f1fbdec. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTLA2221241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e5f6121593a37c508c715ac87efd5cab31b748d55cb86c75396ef2d04137da. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF2112003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbde41f0baf570781db5748f5bb0c4ec270684da569cd168cf228002f5b4f7f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS7J2338083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb410adb63e27cf3edaa044f5ef7b8ea48f56a32efa0c98f456b7c9864da950b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2438223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1968e43d49444847292c1cee26800a69c06afa0de78e32d064a049494c0362cf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMZ92442726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73aa939c19e1fdc75fbd4ea703627307a9c84ab94301f9c1b9007b77a757898d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2449914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32433978a5bc36ceac374416e810965293a823fa63335159ce8610831721b9ca. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2438224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd6094ccc3f9a020f5bb5c3da053fea8b30b1db6a3e9f515f13d05ae0e87028. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJX2432458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e49e3295cb4f72f93c4c7991e744ebf8fdcb5720f20d138722950aae1edc4f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJX2438225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9c5a01f774ad921d60cf25558c714d5745eac569c8ec3a871fccf69f07b023. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJX2438226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd60bd8e4c1ba5c128f31afa360f8145f479ed587da6809011b4176009136f8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJX2438227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f73a3a3750cc3c04c7dbad6064ab9dff5eb038860cad37cdb1350c8ed226611. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2438228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36c15936d056fa653287d19e427b65ac40e21e4db5c380d7c9c4daf85689e13. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJX2438229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d0d3766ffdd96f4c7a77928e0ec2964fcb3058f683518539abb704a924137e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJX2438230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ad5e18cf2b271f3ec9103ae656bb45e28461657187a89166d078d8d8272d27. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJX2438231.