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 0x1037418ae2e0308cc012a2ac44cc40da1da853a245001a9def388f3d7445f053. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e3355b0-0d1e-4b5e-8d55-79ca60ce0f15.json and https://artists.proofprofile.net/proofs/artist/9e3355b0-0d1e-4b5e-8d55-79ca60ce0f15.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 0x2d49fea07fc33dab3b6e5ce665fd30707b3e504a3baffdb186cbbd94b3989f2f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN52524749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd3f642bbe1349261c8a97e548ee1f2ba9a7b59223975e6be872d7f8bd31f78. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN52524750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f1508f89f1ba0e5694a012a8c9b5a4efcd5d03f42c28a567489a6cce9dde56. 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/QZHN52524751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdb07b48126986972cafc7adda28d49fc942401bf8746a939ddd82cfaa6a35a. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/QZHN52524752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f3c1b2d69fdf3c2b605ed8c1a2803ff334ea1b09607b979ed025bb836a4941. 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/QZHN52524753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7758bc194966fd398049f9165b66ae07fd904608189bd70a01af3704a6e488. 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/QZHN52524754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd570af1928ae54aec60a318754c0d57820704ecb8f0ccdcb9f07073db34299. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZHN52524755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187ba441dfe8c56b2e6d4afb062eb06c73bb7cfe3ea4b6b95176754487107080. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN52524756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b0b6fd55ee0275c363f615b8a86e13afec1589f9a4c472bb6b1222dbc9ee23. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZHN52524757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f045534a8f9a6d228bb4fbd131b8b43227eca64dc35af4bc391733c389f740. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZHN52524758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b18a29d9ad6cab063d913a03403e57a632bb174f22d172578e6c9ac2e3f1008. 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/QZHN52524759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7849150b0872e68ac2815c53cbcdf2a7733be087ef2acb4fd5c082d4477ab561. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZHN52524760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a031e138408875cbf6369aec9d9a5abb5268d269dfbfce2540bc1ade28e32a4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN52524761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0983ff0d3e04de35479690c7b69b71fd2b6d301b4a4c00fd745ec342db840d8. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZHN32557220.