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 0xaa75e9a701c33201b0d080c7ed33f37bd6a0a580eb600cd059ed3aec975d4d41. 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/49509b94-af1f-4ae4-b271-22694967c6a4.json and https://artists.proofprofile.net/proofs/artist/49509b94-af1f-4ae4-b271-22694967c6a4.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 0xe87b02153a074ada1b871c94d466a98b2b30477c2a2181efa12cfac24cbe64c3. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCACP1620141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a9d0e06ac72c32e1b403ba9b6f7556904cbef803405bd414cb086aeeb686ab. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/TCACM1639952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cf9de443d871d279945246eba86592009ab56e7f501e3d868dd250bcaa142c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCACM1639949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc12f7c6382c57a0002cf37feeda53f7f8be532282b1e50428fab48275829344. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACO1667583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74396ab09aa5ba3845846b8dbf66fca815a55cd63f8598a44c22bd524fa2cefd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACT1626649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a72caeae333e1efa19ce776189f4b7ff46a921c1c3de5fbf2ffd064bcff24f0. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCACT1626702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee28636bc293f941cb6e979d05ee82c309dee5cbf6bcf2abc41ffd34be1083f1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCACT1626715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79eec8f6be20bb49b101a1ad5aaf44cadcefc1ec4ba4851acc26cb420891f3f2. 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/QM4DW1825991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97469e1fe5ab20dbcfea258b076f8b77f5fc8f5378055b30758032cf09ab0772. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES81844903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9ffa1a75ef48b7c08385cfd57ba292dacc502434e2250b5df4d028800ceead. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZFYX1951482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed35269b45eb7e3123a646fb17f0c4f3b0c49ff6401cc9906c6e6b0f9dba2784. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UK6KW2000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c696854fde1b2c264e07ac60aa54f9652dbfbf2e0866f9518461896a54c17f. 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/GB45A2002346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c696854fde1b2c264e07ac60aa54f9652dbfbf2e0866f9518461896a54c17f. 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/GB45A2002346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d5cd1e6cf93b3b05b20c6756483245c6e752c8a7e4b9f24aa4113b8e16d720. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GB45A2002350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797491e18ae9c0e669c32e010c03b5c47d36a84f5dd2a59c6f3bef99530eaf70. 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/GB45A2002351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02578ef0c396f4d56e3d30fcc08cd7cc3dee8f76f3d176c8233b7b9586db1dbd. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/GB45A2002354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afd569382375fae526f96050ba02e9acd160bc7015e22ed4199b823b2ee86e7. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GB45A2202794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82260702d3abe873f3dca163ebda6eee49a3b67f7715ac243bae5f99b20823e8. 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/GBUM72107890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f09382117c42106238227853e1f36ffaf5b22e356f8f71708b967b48e80716. 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/GBUM72101637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663684a9538f0b693afde4c438c1b78f0993831d35ca0302b36dd250af305d8b. 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/USYFZ2031605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7beabdd10b2ba9e73b996fd604c309d03000c67f41ca257680cca3c7e1ed427. 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/QZVR22400228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7beabdd10b2ba9e73b996fd604c309d03000c67f41ca257680cca3c7e1ed427. 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/QZVR22400228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00c19084b13d8434dae8e8a5e1669a3f32f49a7fa9170be4b9e1b2bcc04a1d5. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/QM6MZ2180622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9d4fb39e2d700cccc98ba6a9337db3d59c4f2c0bb7a9a87ac5ac3e1c3786d7. 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/US39N2300424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc133f5d152f88137049a1b02830ba1727bf576139daf34ef07c2e5dbc4e2e4. 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/US38Y2309144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9d4fb39e2d700cccc98ba6a9337db3d59c4f2c0bb7a9a87ac5ac3e1c3786d7. 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/US39N2300424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9d4fb39e2d700cccc98ba6a9337db3d59c4f2c0bb7a9a87ac5ac3e1c3786d7. 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/US39N2300424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb25077b0bb84a44fecaf0e7268e1e29d0697cc78f2ff9aec7442f8ddddce99. 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/NLZ541600993.