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 0x9f722eba6bd7181c149666df17934b95a7dc6bc0363d85c0ecdef380e107ea56. 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/9cff99d9-fcad-4468-a8e2-698ca92ab9b8.json and https://artists.proofprofile.net/proofs/artist/9cff99d9-fcad-4468-a8e2-698ca92ab9b8.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 0xc7192892a15211e201044734dbef62e89c43c67f3f26dcf9871e50ba40e59336. 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/USHM81902974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032c682fb88124331b91179155a4fa8686a8b06b2193b12bc69ff1a3cb04e826. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM81902976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4a05f17dc99a0474400045bb42ea660f9931f2d91af608b66f8f3b09a904b4. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USHM91292645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54bc115187305abb614935138e6e87c4ca53aa7c6fd8d31ef7dd3561ba6b412. 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/USHM91292667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6480413568cd131f1a94f5feb54d404ba6606a8b7e61b5fd3ce8c4a87bdde99f. 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/USCGH1111785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf676c1ca01290533c8bc1ee5acc318c21c989345712970b97b071ccf544f7e32. 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/USCGH1111793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098c478a2cad4ec851c27882a4cb02ab8c1b86c54f1ef30da9d51e7f56846e27. 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/USCGH1111795.
Childhood Memories & Lullabies on Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f77bbd0efea0f95f9b6eb67927b64a133018aac1926b69a45ce5354a4a61b9. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/USCGH1111765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b744e690d4338cf419d0ea1f34fd46a303a12fcdec72395bb4be7f6e557c8a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGH1111766.
Medley: Farmer in the Dell/Row Your Boat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39010708c6c05d58c1c2971fd5885612001d3a26c75db8e908aa1334d3af53cd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH1111767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a6ef5afa72cc2b4b3c4115d3939034a4573e5695a394c817726f38006e1a79. 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/USCGH1111768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc3af0a08384073ff07a77994157ac9988195f619e508772728fc48aac4b75c. 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/USCGH1111769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34b70f19ac115e9b361da2179aa8512b904c9d9e1a8da2e6cff788ec54f4242. 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/USCGH1111770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9fb52c3a4ec59d33f62f907544fc5d3a063d1eb0fca0b68673171a55959d74. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGH1111771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecf02c6266ed87095046b3cfb932214bf4902ba2e94b6f5cb083ab68fa4e3c8. 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/USCGH1111772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc663e5683e3e79222864cc98b53ef01f8e6e0806e767cf4b4045b1590b856efd. 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/USCGH1111773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e418be7c38cdbb3d8a5a7c7f6c55f91d0c6ac93b57c17c1512516f633be958. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH1111774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261bc7602c21fc82f4c5757309598c79b13a247759ed70b6afd0e730d84ab6e7. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USCGH1111775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e645b63c268f797ebdfa9dab8da73ea14c6ee097245aca8c2ea24b2e0d170f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USCGH1111776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de00473ff1cd2a3df0f78f8c352ea19d864a5d14811b55289b4e46d88b0474a. 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/USCGH1111777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c887b986f53be157dbacf2ccd4c56a80dd484c902eb24bdd5eff04353628c7. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USCGH1111778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfd736c23466e9125d3fcc5fed87788accc54ec05748cdc67582482b907782b. 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/USCGH1111779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d32c831807180180971a60fa0230f3f74c32f54cb941760cf8e07a3ac30b2f. 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/USCGH1111780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815eee8da304a279baf1c4eda9f7641f50e98cbcfcc4cd85e8f6b49d4062dbcd. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USCGH1111781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc382d7f03ef47778f85218c1e79939b8a4cc9012de4c4cd7c8bc7aad18fff330. 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/USCGH1111782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327f270855590950be8c6b4443ccdbd4178e3cc26496e884ef034a0f0a3c28d6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH1111783.