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 0x51b2a4176af224aa767857ba0d7f4791351845a7da6f61bcf787282ef22d07f6. 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/42e9b80e-e198-4157-b91f-3183560b51f3.json and https://artists.proofprofile.net/proofs/artist/42e9b80e-e198-4157-b91f-3183560b51f3.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 0x39f935f46c6da46c9b733f5201fbbf64647ce3e5edc7f8c404fbbd26d42b935d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ITUM72300462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326b8371810a615ac4e473b2038e416941c180884da2847184ba893ed58cc6ee. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:32:15Z), 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/ITUM72400646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aba54c76ab5b7d7b32b3a66f55f1686d0f6d2cdf5ad9294ee9d798047121a2f. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/ITUM72401153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071f1aaf503bbd1f050698208e54fd2a60e8da29a3de7d287b126fd248518952. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ITUM72401414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf29f093c4e972f2fbe17089fa5374de49fbbab6eb943d09dbd76ca442a37cc8. 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/ITUM72500216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c70567472c6318445cf7bcbf15cd5836fe9e2fbba3c4dd364b0d7d3b08a5d48. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITUM72500197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071f1aaf503bbd1f050698208e54fd2a60e8da29a3de7d287b126fd248518952. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ITUM72401414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698a2d8967c568e9533b82fc743c278117a669e281e9e5bcced604866f0fc515. 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/ITUM72500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68243a8d8e0f2dd3dbe8f78ca58c6b46f55bf6fdb42944e1231c65bb5be771d8. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:36:52Z), 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/ITUM72500218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f2353600488a07be2ee045d78b0837a0be58224c535cd1962945586e0a4651. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITUM72500219.