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 0xa332801a7e36e45bbc42171c4053315f3da6ffc427a48dc82d35fa5446391e5c. 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/d733b036-54cb-49df-bd75-ba9a6ca57b4b.json and https://artists.proofprofile.net/proofs/artist/d733b036-54cb-49df-bd75-ba9a6ca57b4b.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 0x35e404a74e1b055f18c34d2571bbc2045d4801b697c0e44e2906f94388e7370f. 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/GBRKQ2170990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c95ee540734d8c0ea327fed7159175522aa4f986ac173f8390ddf95445feefc. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZ5FN2260292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403286aa54e15f87840744db4077e41e3030f15d71feabac2600ed96284a7322. 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/QZNWW2329397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d618e8a5621568a971250220b421436670407a79cda060f8a80d524a5e6a46. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWW2329398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb00cb4a14808935b3e0ebe2710dfe378bcb69d24747a64d519e40253b3bca09. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZES72332506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3266659f0bb3905bea8b4adae622978059459e0b99fa6403f779e41ba0ed27. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWW2329400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60406fd610e1f5ed03839cca8885257b3013f0a231cf5b5f0c1437f59c8dc42c. 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/QZNWW2329401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a71b6942a8f5474d64fc2f1bf8f4a02d2881090615ba5eceeccf5e277f914d6. 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/QZNWW2329402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea24fd33d7883b8a3a5f6578310a03565f09b3a73d006fdeadc5391f7ddaa921. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:27:00Z), 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/QZNWW2329403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81b20ccad823b10a7e036b1085b95041e126f7a405a7095a2fe2f7fbb128aa5. 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/QZTAW2315187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693e79fb97629849bc7d4fa17453757ea452a387d90080bff1892b0d244a4347. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZDA52438122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e21e1ab393cdf8b082dc887fac91c89a432411360f66b1086f9a4b56beda45. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZES92454748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6aa0e83cf6561d1365d6de0d4abffb97dc129d167b3500eeaca64cbbeb4bb94. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFM2432122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a694159b8d61679de62be3da3fabb31378af6f5bff8a84e6793aee25263c126. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZZ782456127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f3e3ead37bc49fda4d4ed51c24eb089a77f500250de9c4afd46537f8fb36f9. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZZ7T2482028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d901e5f0d6e8ee37a80b48b95acfdfeb7d110b69c2502cff986c77f0fdbf9f0. 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/QT3EX2432047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd63212d94a761b179a6bda5447841b94c28de733ef379c36e1d7a841147404. 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/QMFME2533783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ddcb81b30d97d9be9c2eb8b7d5ced241717ea4026b9c50b78b363de4d880cc. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:56:51Z), 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/QZTAT2176871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683ed73360ecc1261e951e901c656a6d7b92b15c0154da07ac1333482f35c18a. 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/QZTAZ2481570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c12dd937052bb796425cf9cf51a6a7b1ca5407c19f4b1ac258fbf0c53ed5f8c. 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/QZTBA2307801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a34ddea6126f53d786cfbc5fed091fba4c85d294283ed6c56da8499a84fae1. 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/QZTBD2419387.