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 0xada2e78f32892463c2f86cd85ab047c68f01c79568e55eb0b01222ec27a12791. 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/1c6e92da-6c68-40b0-abf4-dd73cacefc2d.json and https://artists.proofprofile.net/proofs/artist/1c6e92da-6c68-40b0-abf4-dd73cacefc2d.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 0xd948dfe8147a7881df5fc860d2b2cb5e5094af925992816fe9d6537e50dbf078. 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/QM4TW2120890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425b1b3ee12b69a8af51e1a1cbc0c5dcc06f6140fdf09746ffc51c60384b8265. 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/QZDA81957567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfcc0aa5551272df0e8551fbaac562d238ba914e57a777bf2dd3a003fcdf6e4. 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/QM4TW2120892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d25108f212e49c2f72f7d22e0dbd863abfc635f776cbe54b9702ac93c148bb. 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/QZHN91965691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163c8229576849268ab927aeda21ae06a3d615d6884ffa7fccc9cb9466aae828. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM4TW2120894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd741ec75cdbd192a88fad1d8755075047d3c3fc4a9fa4819dfabf4b1e409fd36. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM4TW2120895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0ad31713119cfdee47efce4e371faf00b4a5e49a0d720c7579223b572b7762. 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/QZFYX1983606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba7e6bfa5527eb565bfb1adf6a7c26a8971c857bb0dcd1596fd2e06a45c1423. 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/QZHN91965689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bd5f07a76bc621be16b6bc5753cf978e370b9321c61babac8fdd79ae3bac11. 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/QM4TW2120898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88627446dbe61b9a46ce3e75a1365bb2e1972943d786ea4a0b1d0b2d25b8c15. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZHN91965692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b23c79e765a1243d04fa1de5a06aeff8b4360bec0d7761b90980f3e8540e18d. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZES71895228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4f8e0cce5d6824f5f85644f243a40af68fce2144a0e78b46ddeb13ea16894d. 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/QZRUP2400335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87752ea836b173c437486165b756c5e1b2adbb491d94ac8cb057e5978829f7df. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZRUP2400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad79a9cb923c19128ce924873fbd5f4fc13c9e8a9f3532e99644baf7c53a8698. 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/QZRUP2300956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0904d7a4477144e577687d32abaad3ca15797c99a32e9a38be9f69f3cbbbd6b7. 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/QZRUP2300132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea63e18e9fa4e4480a275dda03599b0c724c10500853aa47eec5689cc94eed6. 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/QMBZ92248077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f480e13636f8b8e0fa3aa5b55df2fbbeff617d58a801602f15470048158cb95. 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/QM6N22297551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3c989da7d86d903129367b111310c1654eb9e79fd70874b633b9265fe6af36. 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/QM4TX2285976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030ca394f3989a44d6660937c024239ba60c7a82d67abc0ea1723e01a56f8871. 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/QM4TW2254445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd953c8e95545943d37f7a51da54a8debfe030f5efe8f69e7379c386b3af99d6c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QM4TX2217848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b33199e09ba8946bcbbab0b2d07f4f660d15b79e7d28c687d1af4d9d294a23. 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/QM4TW2236944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b597d78f77fa22178981f718a91db9dbcc69108b717cd1780738bccd8ddd02. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMDA62189961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5986f8f4f2d99d0191cee3d9c0c389c8b3985de1b2faaa931ccf4ec49aa8c94d. 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/CA5KR2174702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6abf3d35ab6825edfcb71d023d47484dc17698ace294b133892fb527fd92687. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QM4TX2107163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91b91f861b199111ddb444a3eb403953ada48ce5cabdda40f0c95b0c752a8ef. 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/QMFMF2013138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7183c7e954420143ba6f0994889f2df098f5c25d5d722df45be9f80f04d8ac. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZDA61836597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6458e0359342c911adaa44f7716d46fd93fb77cc245a291ca2502f754ba83d6f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QM4DW1824816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad26b6c2ae95d9bfebb1948d546cac36f353cd471fbfaa8af2433b2e315130b2. 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/QZAPG1713762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa165578a12b046f4ea0ac8d1c57ee867fd8f528f846c826b5cdd4ce8ebb5382e. 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/QM2PV1691776.