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 0xca277536e1e519d13bf72959a065023896f70e9449b7edb779dcaa2037793e9c. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eaba9c60-cd66-4499-bd93-87dcbda37fd5.json and https://artists.proofprofile.net/proofs/artist/eaba9c60-cd66-4499-bd93-87dcbda37fd5.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 0x798724bbdd80c03a3da2f56ff27ebf929d4fca282cc66653f6d81953f6460add. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWU2411753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618eea0e27a7df51ece16993ca61627e8e2babc90e6c06210168d14adbfe6d3a. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZWFH2445015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2f9af21f2f86cce13ec32ab22562577d756d27bd72ce00331ce30c9f9e352a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFP2473947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bbfbbac61c4a8add73ce0595bc16e815c0ccd535394cc6b28abc4695f0f8dd. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFT2476983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e8dce43e19290ba5386a403a09cc3f0b791b1033ab11529019e372fa661929. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZWFW2459261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373a3c06cedeac0525af49d58e359a67a3d0ec84aaaa572e7d4dbe5e98e9c02c. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZZ782450708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80905358c98bb3a9ab9997a1c4962e79da5ecffd80f98374656a30835105bde. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZZ7L2473931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadab46041aac36cfa72cf3d5cf2e2e0f36f81e1f20ddc8679c76889308e69d6. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZZ7R2449741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74df46a102ebe8b05291ac3b3dacdc48361482722809ab4f22832f9efa796c11. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT3EX2446948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3faf237d9cdb8f847a473b00a1edd3e6fcaedef1b607306927c2cac93b93ae4e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZES82553535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe3e88805435db605b8df2d351c4ce771566aa2ab3f9022bdd5d99d0a2e386c. 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/QZHN52522454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe5589fc0691be9b08bf2ee5eb898708b77a4b2abe80dec50f4f860d2bc0383. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZHNA2590691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d8ef0eff95b4a489eb3cedd532573a8efe96ae8590203a233d1856515a7514. 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/QZRP52537743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f3aaa04054ddd8f63e106056fe21f74c984ae69b5faee3ae72838bd51ef042. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTB42545204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadf7a6d3ec6180074bfe1e4f1f486f2b75c1fae3b77150bd955a3a1f55f16c3. 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/QZZ792558641.