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 0xe2cb75ab2a8007cd75a39be06f41be6e2a874ac533ddc75da39d6a77c3c1e178. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3baee39e-4a96-4a5d-a6c9-e4aaf4d64091.json and https://artists.proofprofile.net/proofs/artist/3baee39e-4a96-4a5d-a6c9-e4aaf4d64091.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 0x0c1b3e5769f05856686c30aeef27b756f0827b76c717464117327dbcf92013f4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CH7812214530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09b57526540513f274f7fde521236240e7033c00a6245c6042f59735aedc77a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DELZ32300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfb8c2976a587ecf6703871d299521433b537c590ff5f3fa8917cc28581ac4f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEYF12300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed4f51696081903a9af57eff3afe8163ec7cf13b991df48fd3b3d957120154d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEYF12300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09b57526540513f274f7fde521236240e7033c00a6245c6042f59735aedc77a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DELZ32300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17aa420793921cb4e6ae37ad109628b21c5bdc5e2f60aab7cf43e46287588903. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/CH7812214254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6414621be5011a9470b2cd9e868b9397fd6458ef8a66307dfb0f967e3c2a426a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEUE11507348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf51ac4048297f47d1fad140c0ed368ee99bd0d3bc5635803979ba63ad5b1ee9. 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/DEUE11507357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3278d0c7512a4da53114935ba91746333e719a9ebe34c9b15668a4002bb7aced. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEUE11507381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09afd2ee8411b0b1e2af121f7b633b64907304b781ddfbcc222654918ca36f87. 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/DEUE11507384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6414621be5011a9470b2cd9e868b9397fd6458ef8a66307dfb0f967e3c2a426a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEUE11507348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb341df3f1073477ee84e91891179b0a72e8ea6ac2972e1db76240b303a843a8. 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/DEUE11507352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf51ac4048297f47d1fad140c0ed368ee99bd0d3bc5635803979ba63ad5b1ee9. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/DEUE11507357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1779f90c3812d6f1b6720932b9b2d6ca4ed052104ccb85dd691adef78a83ddcf. 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/DELZ31400008.