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 0xe0f1d38b1b43e16b8150b197c0f18a8749a9d143b495d9057b94ffc4cf828e37. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eec2694c-8687-4c9f-8c64-341cfe564581.json and https://artists.proofprofile.net/proofs/artist/eec2694c-8687-4c9f-8c64-341cfe564581.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 0x3977351edad811922fde2eaf9c6115efb8ed1cc3a8dcca5ec68afbd028e529e2. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZKWA2313248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c27c49135e78bad65acbea8200c0991cfc7266e1add6578ef75c225083565c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZKWA2313246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92edd83c89528ffb606997139f4a01747a5632f503ecf2fb943d13ee0ae9cea5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZKWA2313244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f38d19058453ab8629f4acb8dcf87d2cbd1801322f50b03527d13332fb9310. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZKWA2313249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd0c8c096d4f0663177ab4d52895f9f470b7c6dae99ef68b897f8967320e409. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZKWA2313250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9373cfa719aabcb0f0c605476ede824ad0f3a6899a526f729fc76807e64fed16. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZKWA2313247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8090504811b7c7f9c342f84d71e4268ac3e9074ace69207a5b4962606ba6c0dd. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZKWA2313245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb9adb2d1bc1c282f5c0db1e88b7d759ed432552a37ad2749b1593e3944ef36. 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/QZKWA2313251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbd3acd2eb697a18e5bef975d1db6c575e0d0740c8add5f43fbc9fd9b422599. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZKWA2313243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e3f06f7186c579e95fbea59764486cf6312f1462030245e01a821171f6a183. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZKWA2313255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949176507066c7f9b0c90d4087af9916a2e760d7da10b585e05796f5dc588534. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZKWA2313242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aee773002c0d7b9de5721ed1a5a3b122d5dcae55453a7262448acd23b90bfa9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZKWA2313241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afc76edcb74da0e16a21efb1ffaecf6fe80ad8ece1fd8df5416fce3259a545a. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZKWA2313240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9bd8f30c26b36edfdac36a575b860d30b5802f263a22d16df51f395c5419d5. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZKWA2313252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade0f8cf1171be7c370ea696d7d008fa28a817a10916f406c6a1c848e44a32e4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZKWA2313254.