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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 0xfecd3bf2589f5bf5b98079cbed0e9fba13e5ec98a2b531fc5ce34ef15d35fefd. 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/67276873-93cd-4c3c-b3b5-5b9902bde94a.json and https://artists.proofprofile.net/proofs/artist/67276873-93cd-4c3c-b3b5-5b9902bde94a.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 0xe50b162668019f819ae521ed0e420c5938034c734dcd9c6ad8c2b853688e2376. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMJ9S1300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab9899b4407a0244437854b465f2024161f78f90066af63b8cb8d61478c20ec. 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/QMJ9S1300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d910c6ca705ee9338cdfe769f437aadd84bc4774efdd55fd09f008c76b4eb5. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QMJ9S1300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936cb58a68252348f7211634aae3c51410c2e68b725bf953de11f1e71b1e5975. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T13:49:38Z), 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/QMJ9S1300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb99fbf02240b8196ad2bd5d842c87da51275ec605aa9c855d411114f86bdcb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMJ9S1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751c2b54443ab92f2ba04a827a37b0c54dc7a9c7db267b0934312d2a8c1bbdc4. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMJ9S1300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2a2229126e0206a26624ded0a847b2ce06f684b5ba5a05e2016ca8768684f2. 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/QMJ9S1300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2773b2b0187a9ef18a8c340879e0667a9ea862badb667e4712ec2ff8d4d3b517. 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/QMJ9S1500242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755159b0dc80dd0595321e234191b22a9981f49ab368ee7989672c11ff4cd0dd. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QMJ9S1500245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efbb1ff51125e98542c9a83b888e04d6496aa6e653f23f2635e9725fc782038. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QMJ9S1500246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4eb175e80f14c0a99cfe372e7e067071c5260da09abd13029b04bd4248789c. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZ4RJ1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b0df93975c2df0a4b1a381c0c1870fecd2938ef0ab42002bc7f7d12b32b9a2. 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/QZ4RJ1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0b580af8f4f69e6f14b4ffb67e773b3c7d1b9b905c514fbe0e30da06e8df2a. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/TCADX1883229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1066ee09263937a31aa0cda86fd71634b9cfccb0b301902fbd54c025ceea011. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNWU2433358.