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 0x07d049062a9b5e2cd7aab0b9d2e18904f99de69dd0dba229c97121451e4804ce. 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/b4471766-cf5f-4c3a-bc6d-37b4c723b2e2.json and https://artists.proofprofile.net/proofs/artist/b4471766-cf5f-4c3a-bc6d-37b4c723b2e2.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 0xb53f7fa306762be7d9f5e25c6f4bef6a4ed37fce01ea28b3054fafbc8ba0af95. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZMEM2193436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0269973c1e503fd2951cee971eb57553bc98e10127bd9856af77729e490abac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHNB2138771.
Sonata No. 14 Moonlight Sonata - Beethoven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711b132480a8601b51815075bb80c7b372f2fe570e95bfc6394db2f062971a0b. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZHNB2138772.
Dance of the Sugar Plum Fairy - Tchaikovsky
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c6fbc229e493ba12db74ac5266e219c6de124716ca1d7c36885acddc9df6d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZHNB2138774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db98065f7aa6dd37e654abc2cb028b10b5e82435551fd0bf9a1f695c8e46e0e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHNB2138778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf170e616f35ee22c3f348c244b0b75ff46445ce44fc4a67064c268471fff9206. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6K2071176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabc9ce1f73e3c750813dfaa179e31f4263964ff5026dec141bce87bfa7621aa. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZK6K2071180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e29996ffc30f1c3a261456d6e34a502387f511a70dfd2c24f8d44955ab245e2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZK6K2071181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d069f20aa06314d0cb8c9cf866283e8a056a543d1aa9d00b87c656449630cb. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZK6K2071182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3bb7a98b36c29fdb73498f337039247fd46bde8628523eaef8a4547fcb6d76. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN42022550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6735e65cae3ab310f9e7ed92b3ce7b19babd33562f8c76621ccce267aa158142. 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/QZHN42022551.
Melancholic Piano for a Rainy November Day – Piano Classical
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05f262eec01dcb37d913a8ff9981837030f8f4f325012ab2c91c4da6ef702da. 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/US5UL1721617.