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 0x1c571c72712e85d6b07180d37edada4312ff35f067cae013b8435ec37c2ff928. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/694529aa-1553-484b-97f2-8ea47fdac232.json and https://artists.proofprofile.net/proofs/artist/694529aa-1553-484b-97f2-8ea47fdac232.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 0xa13bd7b666b3aabf7aa0d546d15c826cafd0f0d906ad01ef67d1c2c8a193f2aa. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/SEVGT9309001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96255c2879a78035f7f75a2371e60a113d550e9d6d42343706e5ec33593cb005. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SEVGT9309007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1787db136d6891e02466f9928168f2d451bbdc11db49043975a682c8332f894c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEVGT9309009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5e9c970388cca780429c597b311b3bb697e152181cf82ae2d9233c775a16a4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVGT9309020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155d4905923593981f08a2149fae844fc3aea764a219758cb9f7d299f9f3fd17. 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/SEYOK1923281.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1791b2afbb10bca0fedb97af8cc43588f70c77e2d200a184554c197a5d8680e. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/SEYOK1923294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e23c57862fc0ace4493b200d4471a4e7e30f9ce58cc6038fe540548d6a7d166. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEYXC1600213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe010c56ceebfcfeda38e4155c07d7c9cebd53c63e3b53d9bdb0879f74459cf2d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEYXC1600214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78c3af4d4ee96c5532a01e4e8791b27c86422e4b2b897a263d0dd1cd9b9c9d9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEYXC1600220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d39afa2982431ae2ae7ee9f02e9bf2293bc10a8fdfce939ce49f1e46f5913. 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/SEYXC1600228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9a7cc6179893e2de7570c61261e4377625c304277f79222d1075ca9ae194a2. 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/SEYXC1600232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6cf7bc822927a498dc7dd53f7ae39e9812b4e99222d55a553df45464647737. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/SEAGA0103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b2a9341bedff81c8ff4afb74afdabb5318a6c6b830d68dd0797a8055b8d610. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/SEAGA0103020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2b81d795d93c6edb0110996a475e25f1bca4b2a4e0c4dfd7f61f4c9d002b1c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SEAGA0103040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62d8df5201a783f62db46fe78ce4b22345fd65381da9120623bdb70875753c1. 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/SEAGA0103050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9701d49272ce99835aec0f2c15e158d595d425e0242234038f513681babc9271. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/SEAGA0103080.