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 0x6364a8a1521ec8baf21ad97d2f9b8c872d7a884e67bb1bd89a89402cd4155cee. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d44a62af-20dc-4729-8e4e-f687d725c735.json and https://artists.proofprofile.net/proofs/artist/d44a62af-20dc-4729-8e4e-f687d725c735.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 0x38441d1ef032d01515cdf32488503c607edb8aa44523ec0edf2644abcd8cf593. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6F2566675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2364de15d7377a1dc4a0482a819462052892be5d42d8311d725525ee6d1820. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZK6F2566676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438f9ecb68a2676b96c40fa57e8aa29fd7a7a04ff76b1255b48d1846d0fc5b38. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZK6F2566678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c867ceec60daf205461b52855c6b1e6c1d746bf18c5715e6032845186bb9805. 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/QZTAZ2553137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d13fe6c97d9d2b82e9c65d70924f2aa963b5ddfbe91d6bdbadb139d1ea22934. 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/QT3F32537261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ae73a05e45b73b2750e456c992f1c97674d137f1f800217db747c43352e994. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QT3F32537262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182f6901c2baa36a6d9824b651bf35d5bafc4e1d193f9887cac8726dc36505e3. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QT3F32537263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a4ee8386f0d5674cf6ebc1933066e85c48b43d83dd4571842cae478169415c. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT3F32537264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe712fb77cc7e0a45189f7705e5d206b0267bc85d592e24ccd838277b7d0ae32d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F32537265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf58d59dbbb58ef10c76a9bbaf7546410d64a62d23df6c7c1714f050e30529e. 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/QT3F32537266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8add0a4bfbea37e457446b170f483618e23c40c0803f9a183af32c5845caec80. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3F32537267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61231cede3dcbe8e68d5bccf876520100e3da643c71d910cf4b35f33b7005153. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT3F32537268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045c7115507c76047ccac922baf5a41f157849f8da0aa47ab513b2aee2590d22. 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/QT3F32537269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbafdecf0e0a5b70e4ae752632addfa66047f7d44f0699a1a50e01b81671c40. 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/QT3F32537270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5065f983ed0e811d52993398d81da3d7b70fb46f696f5fe47bbbda257a716450. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QT6EA2574467.