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 0x9fd4aa14d33e9b3eb9a90b358289f5d49fd5bc54a21f94b11f160893c7613a63. 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/dc9c4c44-35bb-48fb-a27b-8e55467a5613.json and https://artists.proofprofile.net/proofs/artist/dc9c4c44-35bb-48fb-a27b-8e55467a5613.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 0x3f95eb249e5c4efcefb86337d29ce00df20305244056f049f045fce78696f9d7. 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/NLRD52013866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a58ede06e0efbe66fc1f09a039b1ad34263f50044ae76211f5ab6c13dee0a4. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NLRD52013870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64449178e9d633c5b855d57fdaa01ccbe6dee77da256e64c4a3d7bfe60e7a4f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLRD52013872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863c2b59ef922c30e567f3a2ca946e611b5c5af0d113ff4a4c01f0440c9205e0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLRD52013873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6b8ce6b8ef4a5db207b1942c648bc4f8f522474daab78fb678984a3c4c4718. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLRD52013874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c508b77013e640ed756180060dcb56676f089a4dfe5f9e1b8f27d69270aa32b. 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/NLRD52013846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7a39a36e358d72b085382758d066978fed3fd1bff2893b57ec5eaf1659f0c5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLRD52013849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407d4cdfd2a37490b3bac6eb9a88b8969418d58eca4263dbd14ec9670b39e9a7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLRD52013850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30029985a0a8701a3c49117478a10123f47dae7f7a66218bca42e8225abf1836. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLRD52013852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b21e8fc7cf59f594c6c7022a0a032f91b3c2b82c25970ec851df48b9e7b729. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLRD52013853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db2c9642d97296107c0b20f42dbeda43d45d35163be8cca335a92801f5d57d5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLRD52013854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1066aacfd027d382cdf7d3c601015ab63d38a06a91eb30241180f0cf7c9c26b5. 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/NOCWZ1803575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db83b99003f0f46f394a4444d5aa6dbb1d15616a35cfd993a005d2312757d48. 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/NOCWZ1803576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeec733896416cfaee4f81b8539f594e2e73b9e5fd09cad97b526e1d42f42cda. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NOCWZ1803577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58eb63c7239a311ce582e99273b4396aa5e5947b4e548d23953ca61f93efe6f4. 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/NOCWZ1803578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aa307dfe5e49856f86b0ad2e0b4b83b07609b707aeba849bbe5ff5e4d22e9f. 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/NOCWZ1803579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a372ca1baf1e57d5566f97ac976e5be72c93d6608a851137f560444bf3bcfd1. 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/NOCWZ1803580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf5852de92a2d6cb7b16a7488002ea143e00961891ccbffc919c7d337f378bf. 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/NOCWZ1803582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3fe355e34d3bebd5db96b6b3a709e54b5d1ade0b08d66c67e38fb9bb317517. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/NOCWZ1803583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f5e6973ed25461211f959f828ac6fd249a1a3d10cd1a44de7bd5097cc33dc1. 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/QZTAX2364667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad82868cf9dc40608ee1d1ce072c4f29085ab4ca9748faa41107793d343018eb. 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/FR10S2337452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd0677cfb17705b13ffd4e043701616104bf3b1581784bdfabf28402a9e6bff. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6N2239333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7f88ede24fb9fc300ff65cb02289ce36ea0c9592093d1e645f7bb056d1f655. Chain 2 (Bitcoin): anchored in block 957242 (2026-07-09T01:00:33Z), 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/NLRD52014064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8b1ec2afb35d9bf8a8c65eca30d978acf0e6b5564f8b2e1a722777ff4076f0. 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/NLRD52014065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b204f28e78af27b8056ceb354264dfdcf04971fb833bdc377252b12365dab37. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLRD52013901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7d670cfadd31e572593d3d81da7cb34b3e3ae5acee7d6be9c8d6fe92d37978. 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/NLRD52013902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d9f8e9ff8f5741664c71f01210c655a695284f11cf7732eb8183d4afed21f4. 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/SE5BU2017067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56602f0639ea30e4a2ea3a8a509cf92cc2c1f83caea87de6bcc62e2e04e11559. 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/QM4TW1937099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c75fff31559ab8cba657e5145f1fd887e44cc00cb8590a6dab1547675da9133. 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/NOCWZ1805806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde297769e838e1463e058e5c52dedb022b02349491e0b6dd64fd78f05fffe1e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NOCWZ1805622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7368da926d6afac0c205f7ee4b30e32f3e4659349211524036a4f62d094ed0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NOCWZ1801743.