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 0x7c7bb714146470ebdeba44a1f6b114fbfbe03be83851439e67cf719ae0e8c09a. 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/bf64ee0b-9e77-40bb-8e24-4415071df69c.json and https://artists.proofprofile.net/proofs/artist/bf64ee0b-9e77-40bb-8e24-4415071df69c.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 0xe964e7a87438bc518346fe30d00698cadb3f99ebbf49e291c6986b47adaf2ee2. 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/PLI861300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ea0fcb40a7a5db170cf210a28ae1c88e1a8ee049f87e2f6cf1473985f4e9a4. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/PLI861300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1669fa1862dd6c55c4f3cba0240ef10f5dc1dacab4267457848ccca3216027. 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/PLK321466617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204596d8a557dacf9eb03f2c85179104d4492401c0186c150d5e96c54c499045. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/PLK321466664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e16bef8e158993fb50cf066e3f41cf5c923eb5c974d0da9059bf6ea0310d86a. 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/PLK321466666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b2d176095c009afe277163b9e9c8fee0af712fcf745ae291c144c34d7369ec. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/PLK321466662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9ef579f5d2c52c93cf970ee72446655b4bc5f38d938da59b282b93e701edc6. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/PLK321666675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381775146d04cad40ff63d9552d4bc1dc4462b8ca4c0676734b7e88927de8664. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/PLK321666677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9637bcdcafa14eae651e843088f1fd68855e6d36f94c1a5151f1257c9d4cb71e. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/PLK321666679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61344f2e9d46cb24073cdbef302cbf905140973e2044adb2445dc4eeb6e4f689. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/PLK321666681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36324b7d86e7147f00cabc3c05371398e7c993dc2a2c0914968e115ea0341c4. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/PLA551700815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9899ba09a4e8c796e35d775e65962010c41e6f4a1edf8a3b21e74a3a082e2a4d. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/PLA551800958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb86120d27eafab8ecc756139fdc2408d7a96b34c08aa1f984a6f34fb6b9e0e. 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/PLA551700673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37396d5b91c79f9380e54d887c0256ed81a30e3981b7573ee2969b292ce5e928. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/PLA551800974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9899ba09a4e8c796e35d775e65962010c41e6f4a1edf8a3b21e74a3a082e2a4d. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/PLA551800958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a100e1365fab6a43a6659d08f0e3e580449063424f6a1f4b9635a40e135c5b5. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/PLA551800976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7f6f5b7e6ced2d9a748e97c222b64927f60dbe0fe901dd9d3f74e143cf6b36. 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/PLA551800977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a02f7b75e683f453cc1e3abe542af4bb2e5dd480e5f212f0b19e916a44f317. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/PLA551700768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3c2852ff78c189fcacf85c5a9da013764920127c27af6e475ce4455e6e3629. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/PLA551800984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64dfee2de9ba85b989c8820ea781a882ea1922652e3f13ecb6b9286be56cbbe. 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/PLA551801290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61aee2105ba8e6cab56a6218c45393ab7b012fb43ff92e9c5bce4b3ce59ce7c. 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/PLA551900062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca43cf8bb5f92a4f9e33186af33a24ef9e3648bfc0767c48c9cbd52d2b95cbe7. 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/PLK321466669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64dfee2de9ba85b989c8820ea781a882ea1922652e3f13ecb6b9286be56cbbe. 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/PLA551801290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c82f8593447ec7cad521e5c2c930565d6be621dab83fe4eba885de96720edb. 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/PLA391605212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf883a9a826411f50db006c77dae0429efa670a923e9eaf2214418a35657466b. 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/PLA391605213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02492202106a06f537a6abe94d23a97b504bb4979c6ce905a556de51f0e7da41. 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/PLA681401614.