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 0x681834c39a332a21021d716ffe387a0879674ac3b215386a4e0926406a7025ac. 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/8555a9f5-bc3e-4c2b-a41a-0dddc45353e5.json and https://artists.proofprofile.net/proofs/artist/8555a9f5-bc3e-4c2b-a41a-0dddc45353e5.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 0x0633c1878022693561b8db7058fe2955f4cced115cd5ff1c09ac9bd23b718e22. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZCE61873424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949e947d007e6faaa69bc80e232ff1e43151d9e4f2afa98f1f87a10fb0b9ae2d. 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/QZCE61873425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ace0eb71d231132655dbd0293793194383d39267208b4895b4d9a630666d8bf. 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/QZFZ22047773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d5744dd8d12652091c75f66744e9377580fb067223e3554e7fe38875377d15. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZES92080789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedbaa657f5ab7a53aaac250aa8889e9167a427ee384246fa7bdbf576b2cc10b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6Q2002992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370b29a1aa84493875da3e3b4d01e78cf31916567b88350f289123e6f2bcfc0b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZFZ42103599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01755c4864653ec9cff8656e75cfa616d241dfa278abf09dcc2382a5f5649e6b. 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/QZES52121759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c5de78b657c0654e3248e7251e1a53ac67b840adec622f71df4eb35ac2a467. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZHN62165378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54b90e959ed5bdc6f2274a3092164e8a453968141292faf26def823610d62af. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNC2192153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2498b7a4322832927e4e49009012b92182de8b6957c24b9f69ef6a14b6f128. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZK6N2271579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6addbf0bcc102561b147d688c2b4af5e1af19755a77ee85a2c404c40b4a831c. 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/QZFZ72376781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630a5876c3df0522c3e302864bc5a9ca2b103ee77cff70811bcf420745892475. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFZ72376783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc397cf1ec806fe83c7507e278fd96d5c29643ec7206cb31c4dd2fe1fdd9cc23. 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/QZTBF2304031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd7f40d3cd40f709acfb9a0ad4a5023ffc78ac18edc04878cd0753f1577d244. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZTBF2304032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedea5b4deff64e8b2cd740df1540c1090fc290f59400aec003bfd369fc006c90. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZK6K2444699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d910929ce53c890b9ff4d0a7bd0f2374fb5c69b8adb43d5f5076c4f07c5db6. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZK6K2444700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e7043091f4f88580e41dfea377658d63a0ff6a3afa447f0be3b91bbadbbed2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6K2444702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa08ab6f106e85a997d4d0fd0b6c796319fa187e787505b7458f31cbdb0da62. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6K2444704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183684e5c105de678050b761d83e948384fa485a3a2e93a52d6c9d99622b399c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6K2444705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f1f00ec4f42f778afc8ea21fa0c3a7ed3d74e59f5b0d713c4d89d7243cef80. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZK6K2444712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9294241b2353bd19115b9d7b6b02c0ed21a180934f7d4b738b3ffb2a96e94208. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZTB92417397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2472b600a298acdee05916ae0a5c973241a5aa0a6bc35e3f24b0364320b773e. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZTBB2458600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbcf6af97ffade20426e4922c4e1c76244121720380333bc9af3faf0e1c0d46. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZWFE2451072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bcf1f14253cba1843e9c3fcdf2433c291d531ee2bb21d7915a3c5328ddb9bf. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWFG2477523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e56ca4efe79b3bdb37665e9be85c146b96c54c027b2108b00fa3a6f0c026390. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFK2413351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a64de64ad212a0b8bbac5e77fb391d6cbfde7aeb4980bf9279cea6089ce995f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFM2450854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3d7b1b122a9d92cd55d8a40f06a2cd5f2fdbf92eba8f77ade8143ce053dde3. 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/QZWFP2499510.