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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6409eecdba15dfe61bd6190ad20fc8b2e6b49b9b394c30b9a76657561668460b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b9f7be4-b9b4-4890-8a85-189a4a0009ce.json and https://artists.proofprofile.net/proofs/artist/5b9f7be4-b9b4-4890-8a85-189a4a0009ce.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734aa462a4001333788db135026ddbc6007bda0005776422ee7eec9c7cc70d0c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB42287566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d7bf628d78d966371fe5d264752d2b9f58ef2673bdd3e35b779b2c3bfbac53. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:20:04Z), 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/QZTB92237772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6bec7eb2059b008c3f20bd0083ede724f861c075a58257d0eaa4abdb32aa8b. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZFZ32306062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092bcc81f09499fbdba108f9f932f40e4f6c262e3107a22a9d9b88463fc8ffa4. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZES62306671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4303d62d8e4574d43e5b01e2f6df67911a56fb7a3117e2255bbbb226f0410d. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZMEM2339223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ac025e6db5a1a89eae22a63c9365b11211bbb198ccf97fcf2497202c544e07. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZTAT2349966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e441146dca6a0950a1b9339ba6f980f57a963d1bc8dd71d43644402545b5d7. 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/QZVEM2364010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662697ba8613a06d658bbf3ff44bf40600cdcfff4bb34c0943ff9f9effa6cc42. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZVEM2374745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6e7f51852fe336cb10dcb02ef62a3e908643f255002db6db6180416760c641. 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/QZPEW2452050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f71d69d5e2de473df123bf2070c548b9b54e2b4af4f4efd414f9e30eca3569a. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:40:00Z), 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/QZJ842402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc750a185e5639ac4f289c9bdcfe703ff2e96be16a616b44938cf3276a125d8. 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/QZJ842402303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf771bea9b3b4ce71150bb8226e6b78f225eef1a8dc768c480b052a393440e2b9. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T17:47:40Z), 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/QZJ842404344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5ad454fece50f3c098007b7010ea4ba02ed4fc486dbb4f0d4d2a18dce91ca3. 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/QZJ842404345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181ab8f944c7155ab35e9bfda0b70cd83a8ac514265b20adad28770d18e0c630. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/QZJ842404346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995498087b8ab8ccf3a85191d253f3c12b42c51d7d73b5506534f4823fea14f7. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZJ842404347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab877796ebc7ee45400ebabdb737fc192d81697e4898f371a404373d9d2fca9. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZJ842404349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4992d874aef7f39c15442aad4d9684339c54f236e184e8d622e3ad820ca54f4b. 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/QZJ842404350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407a4162538dd6fc70b894297fdd2b8c3d2c0fbff47f494559c1e3772f8ec15c. 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/QZJ842404351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6acc1402848acb5a503232ddbf84630d2d483fd0a822b129621c14f5289d6e9. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZJ842404352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bc914e08d42ffeb3d3cdf43d54ba49969742eb223bd06925d2f4ef6599199e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZJ842404353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a27a27163eafb07bacc0b363062b0690c6101ddea996c845cbc48940c34c54. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA62200471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f63b1f951c7e8b8868291411d3d3a23520bd5004510149466bb7402c1e31c1. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZPLR2299105.
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