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 0xba029ebd585603f9620941a329385397c8e38959a04b70bbe0937869224ed54b. 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/d9a66361-cf18-4d02-a276-0b6bd5304c0b.json and https://artists.proofprofile.net/proofs/artist/d9a66361-cf18-4d02-a276-0b6bd5304c0b.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 0x6863d1aa2d1060ab87a8a589616955c62b0755d38ab3ca301abcb857522190b1. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZK6M2001378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4496a581726a2f4d94cca8838c4ebe644a30adf1ee5a445cd8e86250ec08b752. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHN82174118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabf57d5dec4703c333bebeeb5f877bdd79a0f223ff39ee3f3dacfff1bf7eb15. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZK6G2250880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc09e844676de869a6f9bd7103867915dfedfc92d92bf1a39b796143229c0c9. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZDA62331562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edeacb7879ba8035d60cce9731d8d154a86784bdd51640c5c891a3ba6d3582f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:31:46Z), 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/QZHN52312499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0121807d967edf52c5878c99589b6dfbe9e4c912637275b3b911ba0a0c9659e0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZK6Q2345057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb878b4ec2c2622f59c45d8c0699a15a41d4e7779d8ebe3f2cb0a1a6e29827c. 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/QZK6Q2345061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7839b31de181004afd280bb5b507d35f0abdb14ed5cf008b2a8ac1a6604f01be. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:32:20Z), 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/QZTAT2338071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce633b58686c81003b128708aa52b66d3eb52d5d8ec051f3d7edf73774aaf38. 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/QZTB32316200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9958a9e462ec875da5bf72417ae43e3f423576e13b6b5ed666230927935db74. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZWFM2396921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902e8e115ea0e87838622ecbf5a33d4d26b1c5c4a93f948b9ff063843d355e2c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFN2354331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2552cb36eeead80e360bd94cf647cdccb94646f7a10c753c7bbdd0508e0d6ed. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFZ42403651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa035e20ef0acd1d233a1ba51a062230f86c5be927f9fbd5f8251bd7d0692f725. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZFZ62426115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dcdc6f476a66012bc1285295cec364bd4f7155e101c83bf36d56b2316572506. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZES62498014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4f013c29bf83404f2e4f5dd1e57ba0ca53c92b652f146264bb6c2845db0d98. 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/QZTB42419060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b24f8b478507bdaf936caec7409b4fc1b02ff4665e49b897c865da07509225e. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZFYZ2519992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd11cd72da9623bf937429758245bae22c9a6e17e24ce9f130b4d34adae4431. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHNB2585250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ab22243a8a2540bc02eb20f3fd065ef4429843294314b63e1838ebeb915628. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZHNB2585251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce466ce0945e990ab3155b125f923d2ba995de9649af7429334d18b02932156e. 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/QZHNB2585252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd654c58cc499a13cbe6ddc1c9e37534619e0182af9ebc1f0ef1eba63eb1316. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWT2364575.