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 0x290b565750c185e299fc237d7bd5db0634f6a970dd1095cb9bb4efeb84550ea3. 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/588eeb68-4560-40ee-b79f-ac69ed308d50.json and https://artists.proofprofile.net/proofs/artist/588eeb68-4560-40ee-b79f-ac69ed308d50.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 0x5cee0ff067d62d616032fa68e64274fc677ce3b9900cdb0b6bc8e33dddb04609. 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/USLZJ2352099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4021e4b91ff7730bec1625417356364f84c0a706e492f3e444ab6ac5d2ec0ab. 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/QZTV32486401.
The Man with the Hat and the Tan (ManHatTan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56c574f37937758b8b0ddf9a26845f41dede6cdc8539d611667311449735ab2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLZJ2258537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6e663a3791901b79ce3ede4c038acbea5b565755434872925f5c9221ff1f01. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTRX2421064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998443ae0cc8f63ed35634e2744d35acb7fe8087b60a37792d2ed8719e14cb60. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMEU31506560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebc1230d00fc49c01d049075964ac46cc551ebf9cedf58881210c7e29bb5592. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMFMF2307226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375e12e10562e148aaeed0ad0763442315c9137f9ae06f8df31d2e4bdd8be11e. 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/USASN1701169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239dbd29ba51ee6de619d88ea9e8bed05bc30239fb8002c740abb52002f6d8ee. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US9PJ1601001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21f16aa142c0d2390c3e115f9f2de793f151b7ebb1173828ea2688f56249fbe. 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/US9PJ1601002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9d6432a170bf7024c97da9f0df6b88dae73991f9844ce31bd896ff5a24738c. 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/US9PJ1601003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3f0821650b3e9c5a07d947892902624d420aa02d64e19d7b798ae84bbe5434. 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/US9PJ1601004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2493f660a7052d81af18b494dae48bd2453534ce6d97e394bfe500dd241c8922. 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/US9PJ1601005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d39421ecae4fd4b1bb26d873fc095fe023b423425d1efaa3e9577b533722fc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US9PJ1601007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689e525ff6e9f35531604891492bddb26bd4535d8f16056a8bae78ab39fdf6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US9PJ1601008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd18687365eb43ffd7f272acd66d4fe411f45f60aa65a8e30c14d684d1ba69f1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:22:00Z), 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/US9PJ1601009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0496b1992be090c73c6a3a59c9d5d2b7cb5e5a951895215e85eb9415a3ad8b10. 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/US9PJ1601010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4b36c2b79a2a7c77fe213ffdbcb37c1427d787b5efc0d4ce31e11c89870d83. 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/US9PJ1601011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c125372ebc46cec2b70779a7bdc1211997dad4ce024dd89aed807bf8ee305f. 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/US9PJ1601012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f67c2292a407a4194bf13140ca276864ae5a39a11d58af724538de0e09f7133. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US9PJ1601013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f06d64d64c2d528c941b077abd9b5640683284bfecef98d5f7bfdac9179ec16. 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/USDXS2101885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5e0266e8cd10aaa1d74f47fc64a6fadc476146d4229db7218ceb7552f8c234. 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/QZ5FN2094685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce731a971493525d55ac915152563d1cb0728ef425de076c2affb8d0d29071e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USASN1600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62592493b709d2bc84fa447c7655d62cd760d62ed3e784b11fb5c989209b39b1. 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/USASN1502562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17aa4a2fa904dd0ac4df9f56190a3535b9bf2f93d8cd3a2a64afc6646dbbc85. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USASN1500805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba414f3f642ad0579e4627b77cf95e1f29ad6d3dae723fcf122aeb83e6457473. 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/QM6N22032389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5a301e34296e538b32a99c159f54998c7f9becbe655c5e972435466a1c9c04. 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/QMEU31808462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3881d1d3d894a422fef202a1dc46a2e2d5a5c15c53763675893e709d55d3e872. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMFME1934674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25ddab20fbf8f647251c9d829c4cdd50752ce74b777ee86c1f079a5afbe392e. 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/QMFME1964552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967ebe6ceccc5c25aaa1caa2b229f2989f9416771ee54cd392859dfac2c29cd1. 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/QM6N22032449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca52071d90a6469b373e7ead44c34edb9d770ca67181a2921fa6bfb46b0d654. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBWUL2498837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91990d514e135f61d60ddaab608bda18f301808886b79a0473a31ca033bd2d97. 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/GBWUL2498854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d374172c4bb567df2656d5cb1668cdbee3787b6797d18c3fe3ebfc6f6fa48a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTRX2492392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8a0089dd4ec1d60bd52b43131d06283e7ce2b99a74e4513bbda31ea6b514bd. 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/QM4TW2488808.