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 0xb94f4b6f7338924b3e297d873610367e1f2deeea878e167353a978bc2e3c21fb. 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/8da2ef9f-570c-4b79-a9bd-bf4a567c0a85.json and https://artists.proofprofile.net/proofs/artist/8da2ef9f-570c-4b79-a9bd-bf4a567c0a85.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 0xc0f5eab9c9f239dbd2e2a88dafed4379260bdfd88382a3bf88c08a1178f2ce04. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CBF8B2435396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71bc8781f272d252354d4a9a4ea5b05aa0c933fb035a8bae9a4eb17de48d354. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CBF8B2435392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5de03fcdd57880e5507b8a4e876b23af1fc57a66a5fe9160d2cdd8f235d61d. 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/CAHQJ2528069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ac7de3a14deabf08ff76dce3df5c024a8b15d0caa2def5f10b30b3254155ae. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CAHQJ2528070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc980e852b5a413fc0e38dc9b09b599944949ac6169f009b9f181a529afdc528d. 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/CAHQJ2521210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905618fa909fcbd43ed0185a53bd53a0f0388b8a9aea1de8e5f05bd644ee622d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CAHQJ2573201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cfb1d426d42c313d279a7a74665e1126039a8b6f919ac971d6ecfe7cf57342. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2573202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec11cd1323234087e6bf76970added886c453580339111bb3c8e471bebc0a33b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/CAHQJ2573203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e1c456a53dafdf4a2423649b5960f97c1e792ffaa3f40a9a9ef13f8053c5e9. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CAHQJ2573204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b44dbd58d1431dae40002ca440660031ae0d083fe9c3b1cac50b7336ce39b42. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/CAHQJ2573205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b29d2be27ca500cf3c42a136b6bf3b07e9dc344094d00940c27771bb9f4f41b. 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/CACWV2565174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6727e31ec18a9a8c880f68b770f1d5286d6cf506dac53c29d6516eeda96ebe. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZK6H2536823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61eda9cf503e5b5e3dd1bf07af1b8b5ff9853195c4302f9e36bda73dcab076a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6H2536824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f465d74eb599bba4f3de4e8d08a54df78909ce9dc9c5cef23dc93ab74d11b3. 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/QZK6H2536825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbd40997ce12a1bf5f5ee3d189c381de801ae7f62d7c5b58ecf59c99cb16cf6. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZMEQ2572748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41c214e01daa0568bfd1e34882d5fc91a99d99f634f904f178366cb66319fcf. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZMEQ2572749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10090a1d4c86db09d4ae0f665ead6ef2f4a8781541ee1df902e3403d969d55cb. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZMEQ2572750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302b58cf676540ae83bd328e849c2b67243265ab25bc016f88426f95bb684146. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZTAY2576440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeeba4616b70dfa963ab85e9001b214ee035cf1153eb4e6781742be7939e6bab. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFN2516378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f34234a8dfad8626b5a25070cbae784bf1e5a687a0512c4ac91cb13058e7d7c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFQ2563887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde68083ef784bbcbc0f00bd7001f0260aa1dff4bafb446d102b87f4e0c9f3ef9. 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/QZZ7K2519275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b850243258e7f4d660e5f3e52c5dd33e5d6352bdcbef47f3a09a4f86e582b5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7K2519276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c5eacd212ce896195577e67a71b2fc5b1108b70d721a515ffc35a63516bc5c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7K2519278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4c95a70c4522bb851202ee84130e6222d45dde552e581b7a85667808b68c69. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7R2511981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a149cf63cd9cfd403d7d5a0aa939de3034674e192a33b82c582bad97134ca1a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZZ7X2532264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb996776b822fded2c23793383e89f902570f6d662f2151475debb9011f0a564. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT6E72532557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56de445aec9ec3a7a4aa23507244e09baa42787a44ad6134c0577eb9ea922b89. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT6E72532558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0441d74073e3da5a89842fd8135cb184a0219466ec38b5b7dc1fa8b15ee1a163. 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/QT6E72532559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c320bb9066e4de6361c26b596ac1c9140474cf1e826f779d26e190781af80a8. 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/QT6E72532560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f22c219ee8aa5d777758ca9a5854fdb7d2fea3d4dc4315303b2f1218601710. 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/QT6E72532561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be5b41ac3322536486149a1324bf51e20df472475dc0357c1830a5e2b48075f. 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/BKMHG2400019.