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 0x21865048cb213d7bea8d7e9d7b5174ebb84ed011de997460de5b11f19ab284ed. 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/af1aa565-3aad-4a79-b1ad-a146708723d6.json and https://artists.proofprofile.net/proofs/artist/af1aa565-3aad-4a79-b1ad-a146708723d6.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 0x8a87701efd519e8d2d557ef76e785e084fd56b522bc710ff69124ad67e1b1c81. 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/USA2P2141521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52243ebb33ac7dd36ea01b32ec1ab1f8cab75d46c623ad7120f9a0349e166ab5. 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/QMBZ92042845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd823fc263f9dfa6190dc56bbae7eea60915a95c72a9ecbdd24b30eb395da8375. 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/QM6N22065324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c49bac15762c07c739cc2a35b70bc8d3ccae8ae35bea07599af2a190a77ee58. 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/ES71G2024981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021fef0e2a57a616c1f5fa004b4c03dac2daac4ca62d933dcca1bcd389436839. 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/QM4TX2066377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7172d34d373fb7450dff393e0c3d83ac38f3ce5dead7ff08664cdb8db6c81f3. 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/QM6MZ2091306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada2e93d4761a2ede710177cce8b9d962a523a0a6114a35a2c85afa98f5cb44f. 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/QM6MZ2061784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fff1569a41f15aa0e4360dceff3636158050275a7951bff7ed8dd87294899fb. 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/ES71G2019003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565f20a1a8082eb7bd75de261d7169f226c54e0d70cf6dd313221853cda41247. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2014467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce320256413df8f57376f20df8f7fb1dbb8f39d15135c97b4240e59616449094. 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/ES71G2015228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6097e413f5e69665dc7bf74d31273851817d2756e951e2c0511db40dc9f39df7. 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/QM4TX2042504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e76f91313a943bfb9a2d628702da4b79ea251964001200cce8006ab7f8c46a. 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/ES71G2009455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00d27dc41e96863da378e46df4a94a69d570516e17691027956b92fbaf52234. 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/QM4TX2008338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb786774c970109440ffca13aea69f10c1cab4493b97fc8f308edbb95c07ec6. 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/QM4TW2095918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a122ebbfd67734d6ebda6b22ecafc20e3e7986620c5c8bbec9aeba4656e3249. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1924920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c7ff2432b004f0de9147c493e158dc422168e54361afbc3cd3430327555e8c. 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/QMFME1962706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7590efb9879ee6ac5484c5f120062bbcfaa4eaf213f63aed15e4309785c42c2d. 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/QMFME1947855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9643915e9a99edd0a2ddb58833cb70936629b836123642f4f738c85c19d3d43. 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/QM7281945461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25146085f9975dabd7abaa3caad5921f49272fa07bdcd6c5381ae9fab7f039a. 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/QM7281906554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed4caa2f07b4a84d96ed1cb727763c9b3a542732fcb16cccedf8a20f0add16b. 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/QM6N21932747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f7e9c438d8c06db1e1e4994affdf7bcd8182a5b7e5f662298302de9ba10859. 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/QM6MZ1966986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5185eade23200f3fbf0134257c5bc2dfcb333c37d98cbad33881c232ce307c. 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/ES71G1913433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f4daeee51665c44979cc5744743260338c84268d8758d4db293855ed5005c9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1862511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd2260097185fd30fc5481e6f90b15f275c883845f75316a9036ece0dc805f9. 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/ES71G1870253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c71f05556fde72054891cdf1d5396ecdcbfbaf0b9acaa4a1ac0f16a660dc6af. 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/ES71G1864225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e16d19b5ca1bda0acba2edbb091335940a98462446320dbde12a5e4fcd88c3. 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/ES71G1881544.