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 0x0b3f341ea9ad0e1730d0ff06bb1a9570029faba5c71c0f5ebc77528f161457e9. 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/ffcf785e-5c12-4f51-83cc-8d641fd3f81b.json and https://artists.proofprofile.net/proofs/artist/ffcf785e-5c12-4f51-83cc-8d641fd3f81b.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 0xbdb3e73f889cb7656b54dde5a2b4e6e229fef91ad4a972472561405c34878bda. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZZ7L2481911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e9ca437c787016d4d1c5e5b5cc9a9e5d0433486aa660052a13f473a9e4f8e8. 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/QZFYX2061748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb83a6c01a5e01032678160ed6089b4586aefb7b3a63e288aa3ddd7c7778ecaf. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFYX2061759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8edebe0c31aacfda27c8cc337834e1eb3ba487dadd419c2412c3426d2a090f4. 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/QZFZ72188803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f447abe08e02000c29037b23d58f83da20ff097369ac0126e88495db18811c1. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA42316998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2958f78f245fad6c7c38001d9286c2a6cdbc54316b558353e2850a8b75e6c09c. 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/QZDA42316999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17c1afcce28f25675ccb8dc98b94b0197db6333675130efde4f5e28e6be43c2. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZDA42317001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcf74d2059406f041a57c817e23333ce42462aa6cdb1d4a46254341f20f7781. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:15:00Z), 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/QZWFU2453089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfff9ed92ae169ed8c7acde38913f7d1fac76631e930e9f7cf32c487affeb33. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZZ7P2473143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73aa3d27a0aa76f8d06ef62212d81ea30eef44c700f90a8111164f4544f4206. 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/USL4R2120125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc12f6d33418be04986a8f8d50b96e36dafb7852e2561423d81d442ef9b15cbb. 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/QZDA62028038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30058622553681cfd3802e93401042198b52e007d36167e5a79e3de1a3dc93c1. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZHNB2008550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4d7a080df5f4f71cfec080711b402c85873a93ddf87053e3d703ffc87ae54e. 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/QZHN82013557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eee4769c6085b4667e1856dc229fdfc5e34d0e8e98f9dc7a903cce3b995fc65. 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/QZHN82013559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452ec37896b302fe7369c985bda024bf7bbdd8d4d7fbd8b328db3af01c6936bd. 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/QZHN82013561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efee2a2fa5f3bccbe1c4324882b44966e812b45f425afba6cbd3179dfa9ad1e. 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/QZHN82013563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8a5cd4f82e8073a7a9a287c04871913ec01921a16bb8d0738f4b9542e743e7. 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/QZHN82039562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc770bb4a3a3deb6d76a4f87dd8674bc5bbce875e00e551c8a72c84b6e5e679. 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/QZDA62031927.