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 0x120509c20415f24b8c76d4e2e866ec9c338eacee9695b76ec032e5f3d55f113c. 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/16a0218f-fc76-4bcf-8fbb-eca4b7a4bcb1.json and https://artists.proofprofile.net/proofs/artist/16a0218f-fc76-4bcf-8fbb-eca4b7a4bcb1.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 0xc8617b0a090ead8263bd72fa206e7f94abca6cebcca7491f353c2ebbe279278e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ZZOPM2241566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1cf9a965b23df32a42378853f2e449d1308cab5042a1802917fe58ec993a72. 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/ZZOPM2241568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1d15c3fae4fb056086c7a6b83818f1a60556aea466ebb123a6f415b5075974. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/ZZOPM2241570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5739c9a02b53e3ba5314f37663a4b23aea9047475aeed73169e052ceb269ca. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/ZZOPM2241571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b32de900c5e2485beb685684b7b15505f766ccb21bdd9f88e057dd8324721a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/ZZOPM2241572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980b87e312da6484ac754031f340c1ead5250eb55241501b7f5d732c80a0359f. 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/ZZOPM2241573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4052c7d69d9cf47f88fe49bc9868676d15a4af3535fba1ece4e82a186d7aedcb. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ZZOPM2241574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c337ca09c21d3a9f135f74c13f985eba82eeffb8aed7186887097c6b3838ca9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/ZZOPM2241575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116c81b13884592b42dfc3b60cf31e4f5ba1bf7d15af9350b0dbb4aeed30db93. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ZZOPM2241576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ee95069e0540d711f74604de34928062b823f31f9d0f9244b6ac4bc0cffab7. 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/ZZOPM2241577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678b34f55a7557a6965fb8489a845303bbff256344be6e31ee61e153bd54bf36. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ZZOPM2241578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae89823e488e180fabad6fb84e287f53bd1c3daf13296c25ed20ceff9edc967. 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/ZZOPM2241580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002d723aa51f014b41887077d74990bd8cda729010df42fda7a0f5e42608d879. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ZZOPM2241581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0818d9d395435a2bd732a48c8ccb83be87d809681848462bd493602364fa43. 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/ZZOPM2241582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd47c15b73a99533a2e64d3d418476d28f1d263d3d8d582aafd5be0fdd61c416. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ZZOPM2241583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34804e1df3671bf3238f2754e6bd773294f4bf5c320f712a2019d13de92df3aa. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ZZOPM2241585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce86b8618f850b17c431b04b2d1022ddc06c43456a29f29cd4302ae4b55eef8. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/ZZOPM2241586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bd49514564fbcfe5cad10b1d0bfd243ba56ee3130a48eeda9b095b4e38283e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ZZOPM2241588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa52f7d49923f89a8a24e49ab32fc28a7617a859bdc51fce95e989f892603d0. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/ZZOPM2241591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab72e69cd1f0c267e2a2e3b4de9041328358ef86d70266dde5ce5a75a42d7d5. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ZZOPM2241592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612bbb3fb619041a29ef605d555e603185b3680acc2c578105c46c7d2afdc3d2. 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/ZZOPM2241593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a50722ddbf0cdc3a2d416fbc859b348a27d4eb8e0f6971bc0214656f54202f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ZZOPM2241605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88855ae6e66078f1658d32cc16a200ad8a006a428fd4c3ae8d27221537a53954. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ZZOPM2241611.