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 0xfb6713c4fd26ecb3634764ca6da1c81ca5ba99f2ed77c5805484af5406fb874d. 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/e8d89784-1b22-4f3f-9978-6c78e1aedbed.json and https://artists.proofprofile.net/proofs/artist/e8d89784-1b22-4f3f-9978-6c78e1aedbed.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 0x19ea54e15413fe289c0c1a88ce1eec3a0a8c73799446af18c328054d1bcac565. 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/QZPEW2429030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d5b9ee25b71df3400763e709c9b30fac8c32968d38b20fcb2c9ea9025e4f83. 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/QZPEW2453729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb49eecac27be310a65f9d08ff3ebd2e9a241381592d2d41b79985db51f58684. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZPEW2453732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f477855ac3e145fba174a4d8f9589b73275b13b6b67631cffe5edc0975bd51b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZNWW2435021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd192fff5a32cab4259d5930f7aadc96eaa5ec28d4a8625112427978c9e5b3a3d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWW2435022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acbdc35ee666efcc3f22fb65e80536dd64d7dc2eb6d0dd10fc7c7e63696f7a5. 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/QZNWX2479253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d0f8ab46daa39cf0692f45182ad580040d4fed1025a5965756690d1486a7f6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/NL8RL2448448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f297aa05a224fbd0d68107527151bfaa32ebe0266239b128c4f8c6f37e67c07. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/NL8RL2460317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345f46dbfe9fbc7132ea0cc25427e1c6cd4aa890bc9a21d706bc27a10a217ed2. 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/NL8RL2516284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fe18818acafe6f3d0ea27bd8078127437c4d7132193080878c737edbbd6299. 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/NL8RL2530970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd773cf4442f47db22c201b982d78cb59554c218e03d2ba2223d5f8da861d4a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/NL8RL2530969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2743f3552809105ef8fe276200fd96f82d2593fecaceb514c58516ce953ba21e. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/NL8RL2530967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c47c7e5f7270fdb845966c9eefd644183bf496abdb896fe63298bea225dca7. 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/NL8RL2534287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ab7e592608b8ad5cc0e0418a054de78bfc47d5b8488540ab0147c694a10641. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL8RL2534288.