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 0xdc94c9267712d072de3f41a5fb9407c715dc5fd68c36559b81e00bf38392e625. 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/920279c1-5fb3-4471-a606-7fed7716d7ca.json and https://artists.proofprofile.net/proofs/artist/920279c1-5fb3-4471-a606-7fed7716d7ca.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 0xddf93cdf8e2eca7a6260b1890fe9dfd6501c32a3a33696a252261ead8edcca01. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USJ3V1380603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191a47d6f62e5b659d7582c5d2c7f22e1038d2491028f0da83069143c0764397. 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/USJ3V1380604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7db50f8260004f03e1aea962d999044606fa90ab992aa1f014f5972ea1fc95. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJ3V1380605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3625e966cfabe88d972a5aaab0b1dd4f71c71e81d45add86c0a8726e2a348d. 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/USJ3V1380606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9fb3e6a03e24361529ffec1c58e7bca4f6e01d0e21eb85d31617fedcc469f1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJ3V1380607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7649bc6a0b2953235d0ff205dcfe9ff6b5cda51f81823cfaa27054880a98d0. 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/USJ3V1380608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7faa90f48bc3812b0f872e1c461fd22a7d0a54e098d77389666c71d6f8915e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USJ3V1380609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbad42f390fb34adaccfd47547b7a849a6d05be4c08b38140f0fdff3fb5b3443. 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/USJ3V1380610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6669c86b4b04f46dcb404020be67595cf8a9a841757df9e617db3635e5ee30ab. 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/USJ3V1380611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ddfc3956c2243ea5d63e309caace57074d3f9847a707c52c0fb7a6fba0fc42. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USJ3V1380612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9adacb4b21d4b5e1ae91e46306f0514c808e99c42e78e1cbfb0ed50780c30d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USJ3V1380613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0157746a939082d44c676e5e0d757248596ac2538c624890fce77f11c731d3a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USJ3V1380614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99095d28afc4c1db2a959d76ad9e3acd698de4f55b512d2a97997eb7f68c96aa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJ3V1380615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c28ccfed8f4ee378a355611f19dbfa1e18abf24c9e2b1983d15f2c29989bf7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USJ3V1380616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2e01a488720ee6624ddd2c688fd166792c9a1ac7c2684e44fddfa4ae4499a2. 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/USUYG1165531.