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 0x1e0450b7451e7d87851164e20ee1b1cc4e9095d593c150acd947f69f57c46549. 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/43135dd9-cb62-4cfa-8b9e-bd0228e25b8c.json and https://artists.proofprofile.net/proofs/artist/43135dd9-cb62-4cfa-8b9e-bd0228e25b8c.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 0xc3e95fb3605acfd2917d5db69f4a4f4025576a1a7afcd6d890259367477b753f. 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/HKG732267704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ab93fc880a6f005ff38aa337267ecadf69e57cade3eada3e237f816b56784f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKG732103050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bad8a5d1384553904273dbedcf2d246a36ef7fbf70f3df5f0a9a047cd58170. 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/HKG732106739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7145bf0bb73e64d11f89a3b4c5269d0ccfe8122b23fe2110f21f9c6491d232ef. 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/HKG732106740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd96660c2397fc8820ed7fac2d64e58975dc0086d5c58e470d713ce9911f14ba. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKG732106741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9ba5bdd9bcfa766ed92d5dd905942f6bd623875bb17dbf085a931ab00290f4. 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/HKG732106742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc4aebeaac19f95358e679d65d9cb1311c83e7b2814b40b214f28ab608646c0. 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/HKG732106743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8de856f995e35f3a8ad7d09e9c9e8500be77a9277a0967fdf0f44ce52ea8d9. 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/HKG732106744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56f289f864a7add7dbd5a2e77aabc818a87e4d0c9a16c7a527636d8ea2e4f7e. 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/HKG732106745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556918d8c0e8c2fb63095d8d671e035444dbb24cd43bbe1da426b4c8de35b802. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKG732106746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a3343ae51c83820621e609e394eb3142c87d51bc26e86cf58f521241117192. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732106747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8e73d863034baddb322474ccab97e66ac3a5981955c867201e47bda1d2dd66. 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/HKG732106748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b119b4f92bd123a32f4fd2f3a3bb9f576bf07f929f7373dc6e28ac823f80787. 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/CNZ632300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac43b114aa6980ac6421762326612806482f5756cb97d1ae9848564e5aec441. 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/HKG731600174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7576b22dd61afdd9d443a521d146eebf2a6ae75ab08df2d48b329c6e387df847. 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/HKG732203555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac11df5fac22715d1af40640043ec5f71ac7a6e0e04c7a0e77d713d3d274cc5. 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/HKG732499215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61eeedeacde9933c1e1ab1ec91310eddeecd87cfbfb0a075b209ae45eaad5280. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/HKG731401979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2235e1ec6fd543d5e807dba69e686b79afefb058eac24dfe725f2273fc767259. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKG732499093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f453a6fa550dee420fea3362469ef3343c7ad425baa2f1bf42d629c94ba653e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKG732431316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9214bb34d2e60ad164061b9223ecd6403af1c5ce12f8854fe96653e6fd770f5c. 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/HKG731684587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d5c670af79b257f8b7d57d59d72605b214e0b1dd7de367cc13158bc83e1a70. 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/HKG732341617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b5dc545e2a28b5147f532b2b0334658657ff96b8e69346137a3cdbe4ff744d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKG732341618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb5e2669e70026330e1c9ff6560b154ed4f45bc319f381d983a3ce0d1e12461. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732341619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af9a272d042ca798f984598a808952488ec977c526705b9ea63aa9d4fa1991c. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/HKG732341620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fe030902df81648fe9acf2878b9ddc1e656578a177a59f4d7d5784e47b23eb. 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/HKG732341621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca657fcd0d383d5f126dbd3eab3e864dcc7ff2e0fd626a5adfd1fb56cd507308. 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/HKG732330012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f767a8706fc23130f52f27cbfe43f247a4ca26bf422b2b50c3f9a572ac88323. 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/HKG732327135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388957dab6d46b12134dc746ccc5f95fb364b0b5cfc584d19d37511065ffec09. 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/QZZ972340422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d5517b9f8997873213cafe11be7247b4faaefd7ab73acd6c7d3773f6106f3a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKG731401665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff04235c646e2c3937f28285b9c36eb0ed823d9dc1f354a128471af6fddf8b3. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/HKG732310407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4233aee1306d3272f80b6396c9c8229e4373d4f56c4222335e083b3a7d30bb7b. 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/HKG732103814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32dc59e25e7ed039b716e6693ef8b461fc7ce8c4b4e5de4f51ba57a482eca4c5. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZZ972339390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7305c3fb8ac6fa8ea2aba479ec3539dc525ae6f7753f57e848a05fe5b79a90fd. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKG732018944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fa921175b15b7b3406cecfea3b7f7493df35b0f30ad18cc3877892c033c2d3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ESA012397581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5045ca453ed14e216fbfe4e2f744c8205ddf454436782e692b025d229e71d3e3. 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/ESA012376567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf658ba7c93c65e6340f21d724bb65555da50be8e4628707223bd68522be7a0a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKG732103023.