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 0x8584a580c6b2d7cc226f6e5c6219d5e6c54f6faaa1ea2cd52f7c847244fdc792. 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/38fc39af-1819-40ec-9180-1fd01606ca45.json and https://artists.proofprofile.net/proofs/artist/38fc39af-1819-40ec-9180-1fd01606ca45.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 0x9df3509f7a5c1f7f0f85c022cf5efa468a04aedda2046386c3ec89c6a88275a4. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CZA750115702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1683c43ee59f23d885188a1911bf8f30d02965b218a966fc2b971965baf57a42. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CZA750115709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b02feae3ab65f9b83a305069d827dcf00f9386d5866f37126bfc537b57ebc8. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/CZA750321508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad51df7decb58fd17b773339dc4c94cd70806f1d70191eecf6e87444122c5501. 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/CZA750630702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4847ec3ae4f4e042bd52aad19dda3cd3e664f02c32d95da1827831a2d81af4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CZA750630707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884aa0ccd3c608e172c779d6425ca97cea9cddc128c2c21378bbaf33c6a30e77. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CZA751149101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a46c376aedb6a9df53f36d702fd07e6268f30c0a8a46f7a5e6c4f901db63f5. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/CZA751149103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26566c9c0a7ed3619079835743ce1f7198b042366805633e2c4a20ccaaa3f3ea. 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/CZA751149104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247191de1ea746331f29e0acf9b8c1337982886802194a0d279605b6cb180df0. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/CZA751149106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd277bd1bd53165a2fd81862b3ecfdeaf7c4108da0296a5ee2b9d16972df2525a. 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/CZD701267701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7184d219138f1692eb30ae9b4459ad9455c680576594d5a07f52d288e444bcd. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/CZD701267702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae3905914f91e0d58726350bb1c28b966109db0522a8f73d23c5a624c6aa32e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CZD701267708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb752584a0d36eef70ab310b9642a72714d00a91ff5c365fcfddbe52d61eab39. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZA751656803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a03d3e023d25559859dc63e0a4d3388d7028fbb87850e57c63b0eb340f2de3. 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/CZA751656805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b31bbb354c3c45ac15a959c1e4431c6a2f9e4f9dc8b4c429b9b21899e611d0e. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/CZA751656806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c40997b36dd724c73f8a667fd4a24d39fed39be267d211667bd45948e416bf2. 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/CZL291900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5895137389fa32ad8b021bd84b7cf52ee6a684c9a593b968ab7f5f59b01dae. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/CZL292100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa232e0b0ba9d6d39eb02ebdd42eb9f60c71d5c62f2e5cfb2c4ab91784250d87f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CZL292100306.