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 0x0bd553450d39fd7f14d1cab9a8b629385d45b836845d75b8dfceb0d02aea0165. 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/5c65ad4f-3a3d-4dca-a3cf-6c61f410f233.json and https://artists.proofprofile.net/proofs/artist/5c65ad4f-3a3d-4dca-a3cf-6c61f410f233.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 0x546ddcf31d26c731e250dd37c1e057babcdf9fb28dcbc2cf47fd2bf80868353c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:17:54Z), 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/QZAKB2402211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc5b0622fa97aacaa7250ddb3984dc1c17837818b6d94ba5805f6cff961c066. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T17:43:51Z), 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/DEKB72415148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3334bc922c426c4787455940cdeaf8270e18954dce72e86b3e6dafa1cca218ed. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GX4R52151247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb9a19a1374714264530022d94f1292ad2a578d1257f4dd4ef679512b154be0. 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/QZS662217662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7060c94a58d1a1de5246b941ec5e97fc5ecbfc49590d752466311397c08f30f5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMHN2277344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c8e856ccc881a93a795528a3cd74c99dc8fb51ba4cf2b8ca52cf79b473a8ad. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QM42K2297736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd653a15cbfd8fd71bb5edca6567416749436a0591bc337dc3f9d72eee53d0127. 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/QZS632207374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefb83a20d0b0d9381b4c8dbd67c2768258df4e92f81f24c0064513fbfe664de. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZS642373500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d03670a2190f7c5a9fef27c48c601e3921a0ee12511e22775957deaa3b049a5. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZMHP2324347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd387013f52d6bdf522f56b6b4f2d9ce1cdd0169f9c49e3e0da0b49399ed467e5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:59:04Z), 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/GX7852400415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa738c4586079623fd9dded105cdb9a9eb9a80c36652621b37caed787105e34be. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:51:45Z), 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/GX7852400416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c038e76c334ba0ba8b71631d7d66300bbef4599e607db79538823ce941c3e7. 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/GX7852400414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9bfa53c3257385f631edab2e22f1c6897f17f0ae3162904330f95855b38de8. 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/GX7852400411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f85aeac8b30fcce9eba7bd0b371fe7be3891b40366f84122c237934420a9b03. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZAKB2437398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf305e678ae2812d307f0eb3f5a4c6c7ba4b40ee579ba50542a43e62ee9cc45fb. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:42:19Z), 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/QZAKB2437403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828e413d3303e3923219c06a29bdf3ba288cfb729ee0b83d4e652364b826c6d0. 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/QZAKB2437404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5190168e0a03dcb088893db4188bd81482ec8e0c3f9038e247b33dab3cf4a3ea. 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/QZAKB2476481.