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 0xc37a9b726723cd85b9a1fd9ea7743bda2c716e6348fa463284199ae51f719c77. Chain 2 (Bitcoin): anchored in block 953710 (2026-06-14T23:32:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ebcacd2-537f-4e9c-b84c-005457bdadcc.json and https://artists.proofprofile.net/proofs/artist/7ebcacd2-537f-4e9c-b84c-005457bdadcc.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 0xc4812daba4560ef5a03aa4c6cc6a5d075919b8cc91f8b6e2964bd25187a6887d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CLUC21800547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501ac621c9083a72092337d99b046c5067c49fe6ac88b61513111a3c377376c3. 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/CLUC21800548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18825c94dd2c623e118d477a37fc6bc807da4b6181f43759644980bbb567e85. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CLUC21800549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01438da2aeb1222fcf33214255b124be55f483a9cb36dd64e410cbb1433e0cc7. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/CLUC21800550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc529390ad0724a441b2e4b86ba98d3935f587bbc9c0b4451a43c6a8437c3a3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CLUC21800551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf437fed9e1b020d9c65ea511ff3d4ae4dd9b759a7633994877508bca87a5a104. 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/CLUC21800552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b1ac53c7d818625ca1bf5c638780f786556e6cac017f742a780d8671b34754. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CLUC21800553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39508bd48e8ae62bca1c8948c0ed57b7ec3668ffb0772b8f3ed28b5e16ba0203. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CLUC21800554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2121f901ae43486575f8220ceca381fb96067f21cb959ea6b5300fe283737c0. 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/CLUC21800555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2362bf43aad412c5eac3d90dc66739df5b6f47041e87f5ecf17acf14e92199d3. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/ES71G2328747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd871c2be4bdfd1b8eb03ae189c17089248ce04cc6f7d3604cf12532d793e37af. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES71G2334624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c22f1532a679c142bde87f715098f828c7105408c3fc9604083f1341a164e2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/ES71G2407189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c22f1532a679c142bde87f715098f828c7105408c3fc9604083f1341a164e2. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ES71G2407189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd871c2be4bdfd1b8eb03ae189c17089248ce04cc6f7d3604cf12532d793e37af. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ES71G2334624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000819eab4611604be17d22431b76b0937a4df87d8eff48f0fe2befd3df11158. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ES71G2422828.