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 0x0eeeb638276e7b66ed71482569b1043e9d8d48de60d13efb1d9f499befc5c6cd. 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/b6480094-f71d-45e0-ac16-df8463a43f64.json and https://artists.proofprofile.net/proofs/artist/b6480094-f71d-45e0-ac16-df8463a43f64.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 0xf003390b55de03dd4aadb5f43fcc9b012c24abca8bbbb6fd2f5c3896bb65a08d. 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/TWCC32305674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02b9de229522ccdce764320dba4d59208a1390ae275d893230b91be4e198759. 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/TWCC32310276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d889d2c78123167df057f398e04acca155c62f280bb44e5fe3cbdcbf04c4fd5. 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/TWCC32310277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba7f41c9300bacaa9e8d5a40b1cd20fc7bcc42d8716d9f9b876ef398fa54784. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TWCC32310278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ebd69e1e10d579ca1d1cab83cc271851b8df6ab1211d48b81da6e6a8338388f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TWCC32310279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213fd92b3e66e9758a62040ccfc8a93f05285549dd2fd9c5e99b837006b1be56. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TWCC32310280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08072c925760aca98ff68b0d5fe25652c02ed3edcc5fdd0ec5ff89fab1b05c77. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/TWCC32310281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fde013107650870b830461a27a16089583903503357cbe1f5669c3aef29d41. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TWCC32310282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c15e72a8a25359e0f01864160adbcd694ac2fbd37b8120c350f38e6504f28e3. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/TWCC32310283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817cdc72e095f6895c29d71e573a61e2a44faf8a2d0bf6dca723f855506b72b2. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TWCC32310284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e13a088f79971fa657e8d9ad631aed6b3490ce2a44c22949d6e9062e6aa812c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TWCC32310285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6d17bb42adeed386e40b9dde39b43485ffaeb0ff5a5d33ef451f029fb1de12. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TWCC32310286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7973ac6a4068a23d71ceb750754cf5a22e1b2a6aa385b5934e006b9eb7c43f. 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/TWCC32310288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554d16a8bbc78062b9336e4cb696ed47111b67c33a2d90b243b71ef5bc1bc507. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TWCC32310289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58411d42f7ed4eb1e822ed6c825470543af65e05ae52e2b67fbe27cd19f1e67. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TWCC32310290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361e61270d86a6560774531c79ec18f8144b471626309d404e78624ab35c0a52. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TWCC32321610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d2a069a1472a6788a0628df3e963411bc5ef6804ed3ed4d8547c08a1dfdb79. 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/PL0B62370625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040ff1890ce53e1763c81453940ef7adb411ed7bfd7d584cf5babaf8828b8451. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PL0B62370626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b81638cb5dae2c3b2857df5979ae6ae8d4ed26f23787217f67770ae0f1da1f6. 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/PL0B62370627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720a8322afd6a33388635bef3166ee976225d85133dfd63569a59b3ccead2dce. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PL0B62370628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75aaae2f22766a0c7dc4fe842d32dba738e305ee2811c65380360c5d06602122. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PL0B62370629.