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 0x847dec31102f99c1923abd7c665ab105d532d9d50cdbec29ce233e2dabdbe10b. 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/da4600ff-913a-41a0-87c9-d2c925fb2e24.json and https://artists.proofprofile.net/proofs/artist/da4600ff-913a-41a0-87c9-d2c925fb2e24.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 0xf584173da257dd0b7d648f7030f55ca2b694f0f403fe3530bcf70f2017641b59. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/USJ3V2081301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6331200b93497bcaf5d53317d9ed0b1b768c17db9f3ec1cff3ac8286c4805294. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZHN92201052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72668ba9d1510d4289a36239f729467c1d04e561f8eeda1388ef03833da6018d. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6L2212139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbac489b267ec58785aaf97e6d5731e7399ef737696dec8e10d231597f8b76c. 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/OZTAY2207933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63087a26b111b1493191a16dec1951b02f55bb6df131b011bb53d4c30da0301. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZES72324701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ddccc86f7dfcf0e9ec28f38970658139032130619bc17a50461d2cd5284f63. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZTBD2386280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a07e26ebbb840c125961f19db4d2251810e6e26d6b73ff50e529d302667920. 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/QZFYX2446008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ab1b864012fad0b0485217c71f9464e337cb89468e7f5ea97944eedbec9096. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHN62432272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400fdaed0ef0b2236925126d16ed67224065eeba56233d20287e2cf6f08d231e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN62432273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448325c321c389aadc2b89582750b939f2d1003849d6d204df72fab7f9a31629. 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/QZHN62432274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe930c0c56808a8b350cac003da17d0eb05bdf1e77bc268441ae2a089516f4e22. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZZ7L2457989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a56d3d277fc9477dab3f489bf9f69480cc6fc64b8caad67a2c5dff104d9a8d. 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/QZZ7V2403800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980415c6bde0b8cb348b24e799b28731769ba0a2c7f7b91394b2e8975316d62c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7V2403801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9d6c76745e4cd46c4210fb69d4d5614d1a9c1bf6a0eac5cab3d6992d31e987. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN62501444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf38af4e89d3e003fbe07cc74d01dd69131120e34f398f33e801c4701c2f0bb. 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/QZTB92523075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fd469b7997d54c6577a7e8b0efe98b3b924a56ed5a281e763866262aefde91. 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/QZWFS2554118.