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 0xea322d59cc412c969bf5cf26cd81c7669b67e858d0b66c05e6d3f4b724724f80. 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/a727a259-72b3-41c0-bdc0-d3ce355e7bbc.json and https://artists.proofprofile.net/proofs/artist/a727a259-72b3-41c0-bdc0-d3ce355e7bbc.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 0x9fab1f39e14f12461c7de6a29eea3ef0b7ba932189799c5bc1dac8fdaff7b212. 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/DGA082439409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d304fdf8f4d8bb799badbb9c905db3ec8224746ca5fcc44b7dc4ab0f3f3b66. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG732430031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc876f429e6592376bde085f9a46240c254a197265eb27aef1d879bc189863767. 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/HKG732426818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fecd30b871e159026e4b736963d4e2c5d8f4043c09c28401db42e54274b38c7. 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/FRX762477843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d85daa0e838665a3a5b5698ce768bdd0235a35e005f921e0450cfb7e6402643. 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/FRX762477844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe921f7ba4ea55afe9639fa5b8bde0d726b02937717fbe72ab6643daf775e8f7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731698598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaeebe9bd22303d6c547035d167dbe3ae7c561e57e6cdfd18dd1b24941e7f138. 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/HKG731683697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4c423a30fd441e2ccc86dcdeace41552e80b594549449bc850444e1a3d1384. 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/HKG731671231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1b92518e19707328d3b2be1fd22d93e9f0d887d8a38d97e8780b6c45b92690. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKG731604464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff75feccc682269b3dc24c43b223e80b6d6cf84a8c92e41de01515b93ee2cc8. 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/HKG731603006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72fa29b442c4c442ffdf0d5f90214dea66cfbdcad2ce438ba3ca3dc4258eef1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731603004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98970c1afbcc9d82e13af533e870aad51bc9db0757d2a7a6172623557fb0e5ab. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/HKG732387791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba351ebbf179816cd9a50a42c073d3666e6e3972cffc43f96d08157cdd34a16f. 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/HKG732387793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf256edad1fab2b1b921fe97905547f55fae4fe4fbefcfbbbe2f34e8719ea6c3. 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/HKD012315687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e68a28d798b4472a0e022905a0ff8012e1919d1fbfdb7273318327a6c2f2277. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/HKD012315692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4724454c52c888e451464fc8263f6f6ad07c113d4d92abaddca67cef7b0d94e7. 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/HKD012315691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4928d281e4a319381ac17b508975d6e499e6e6e15791640b9665f06a4aa66afb. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HKD012315696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cff8fcbecada79f5ab431bcfd50d75cc14c55d2d1555a94e0a29ed2bb3b460. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/HKG732375236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bded4621639e398ecdaba97cf1944b79716cd4ad964f8d6a95a4a011db8248e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRX762386623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d1ac6327f8cf3b3942ecbd9797654f90b88648ccd5768fd13ebdfe95651e0c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKG732301599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ee395c564a025e17cc8563e7e35b2d2ea1eba2b969b0c7d4447e8793912f14. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKG732291916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565577503384cf1df6afdd2a40326ec1ed17b530d2a5938882ec39884069515c. 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/QZXLZ2328726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43d6613ad682e094f6a09febdc196db1c248817b3f008bcab320a4e8790f507. 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/QZXLZ2328749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c258803ffc975290439d9ba9fa4c92b24c8e6bfcab4bf94984828cc76aa699. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZXLZ2328753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3ca27bb2e695222bfa8967b0c27c32a9876cb0ef55bb2e2ae869074f3bf736. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR10S2260882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dcd07f582dd2c20072e9f65daaf1733162a27475731c2b4ce4f3ceab8e9dbb3. 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/QZXLZ2328755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aec5c82e38902813c9c303cfffd5157bc51899d3174be1f7993eaa8f4feb02. 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/QZXLZ2328761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf603b8ed2133cecfc50b1a0ebd0c1065e88720660bd4889f486ba3af8f8fecb1. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZXLZ2328763.