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 0x5153eda3ec5bb0acf8d01aa357f9dc943a749f7bbad6a7b9f9007e721ef2bfd6. 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/eecce0e3-baea-41fc-b48a-32d9229355dc.json and https://artists.proofprofile.net/proofs/artist/eecce0e3-baea-41fc-b48a-32d9229355dc.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 0x7143cda9259001739a3f5759d06cbf18158f90ac3d69247f24a065b905cc03c9. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZDA61899935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dcfa6cf5c11cad3314e3fce7128f463abde0ef55f6ec5019ae8c62cc9cf2ce. 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/QZDA61899937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2d20548c4049a5325f3c3d4961de19f7cf528613869b7bc04cd2b361c62adc. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZDA61899939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a25ca61d8a1e77b010f20c2b86773c306903a7546a78dc64d8f34bbd410a17c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZDA61899940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26e1d76393452fd887d4321af3fab9ba3cc2d5b8dfc21c1bbe8a71da6df3517. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZDA61899941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b9f6edcc09d06d8d06e069339795eece69a0e3fb133ed793aa49633943328a. 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/QZDA61899943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e337ef78dbe321fc2110e8fea98a53be2219fd5fad90e72478d7aeffdea20f6. 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/QZDA61899944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5e838aadc800bf89032c06635f2fd666892df53ef594b04fe0fe7d4ff001db. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES91864349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4d871f310368379cc3ab18d4b3e7c050397da08101806c97274bea59e40bd1. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZDA81946553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd9af8f168ed507fd1edd216c38c4ed6ba9d1065d3ce019b628bbf0bd6f4d36. 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/QZDA81946555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43331cc29e1364488fccbc03cde29d0505bd1afbb7e434e669033442e738e7c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZDA81946556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4f9cf370c8a4b3dee4e4f6b0f1761b763e4a99ec6c3655c687c8101055147b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAEQ2052099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d98a7ca41f2be79896baef0b9b089c7fb22fe27ede81403acaea552639db35. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/USCGH2467056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa690da17162d68da5f01ad7fc2ef98093a8522661d40086465fd2b6623212280. 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/USX9P2493909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369a7a86ee984ad389c8c129f0b0f51d755049e816d9a0f70edbddaa496cd348. 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/USX9P2493910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496f3e46b0fa0c741d2c794df63f75ea7b897f6343b4d5498dee974ea755e89e. 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/USX9P2493911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9173dfe72e7825b72f2c9fc0a9e56c7c5c29e77cde90956de5fb17f81539aec. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/USX9P2493913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bf6c094e8a1a018d9ff6f91fd217055572e4d2549c1788f2dbff843ec1877b. 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/USX9P2493914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452674f36980acf9b0d6ec0a86d1a2affed03bd767d3c2b014f8af2a525f8f2a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USX9P2493916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9fa19b218c98f3a76f4f8fe27448fccb499a4865c400e9b2c72ab6bd39ffd7. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USX9P2493918.