Chooser can refer to: Choosing, to select freely and after consideration. A user interface on a computer that allows the user to choose items from large collections of data. Apple Chooser, an appl
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce8fb459f1ea206e27428db1795ee8f3fbad3e29e185f8b254339a72b48a477. Chain 2 (Bitcoin): anchored in block 953662 (2026-06-14T17:28:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5745517d-f635-42f0-8b3e-5922aa69ff02.json and https://artists.proofprofile.net/proofs/artist/5745517d-f635-42f0-8b3e-5922aa69ff02.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a408547e74bce77923014c8c04c88ff23893190d24630ee282fd31708621664. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T16:39:09Z), 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/QZZ7W2493083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0cbcf60d64914ca2713c3ec59a5eda35250aa74c2fc0b3abc2b9ef8fccc110. 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/QZZ7W2451569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cae2ec03f127b58fc8973489230c5a208788514af1b5753c2b1d27d9b1b228d. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QT3F32404432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744ad5848d53bde3e6a43e5ebaa6567ae231ffa389bd73e15b363c57d3016950. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:11:01Z), 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/QZMEP2545967.