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 0xfd2a378e9deccf7a9a64e9e0ef6d78003b198ba2dc743e2b17056211666c6cf4. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6082b38d-fe2d-401f-b18a-bb5bb56938fd.json and https://artists.proofprofile.net/proofs/artist/6082b38d-fe2d-401f-b18a-bb5bb56938fd.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 0xb02d1514f75ca3343ef786272e0e3b67115888b9f018ee6fb70e316767cf6b95. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEZC62330518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e99d321ad3dca3ceb5b9c342e3653249f4e17f16ad384f03b670f23add1e31. 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/DEQ022281863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9162b5c25a040f6a27d6f5dc5b1f1d32380b5111ce2d0d141a97dd9a8a068c5a. 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/DEQ022281864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c611ccddf0df976c2b08774bb0180cf9af32c756db7c63860dbc0cff455ca7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEQ022281865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f68561c150b927f5f5198a6c930db7e351100d151d45999220d204a040e85f. 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/DEQ022281866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174372c12e3847d9e22ca1209889ebf72c2fb9d212cf1e8d76cef1d55b4fa40d. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEQ022281867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c94a87bd1e319bcdfb1c0ae92e1f72cf72425962fb54defcaea94f691ffcf1e. 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/DEQ022281868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e57dc2217bfecbf2528f2b1117e844702799ec80bbd2805405b20a71cc25a7. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEQ022281869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffb0d160f3a8caa7021739e30f7f4ae1f5525831e55571ca1d2c20109b27055. 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/DEQ022281870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e08c2419810d72fc7a6f2bbdd2a62c69748eac276d5398af932946ab4ffe4. 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/DEQ022281871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb734dc64f4e264c611f092cbf813d6944fef091aff5e33548cd0d307f2ffc58. 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/DEQ022281872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e54556875bcbcbc4c363cca9556e7b1a85fe985e32b8fb3c10afafce1399fa0. 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/DEQ022281873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fff52905a0ab8b8862c37e9a9128fc4ed622c1b8e04654ffb1a71878d314f71. 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/DEQ022281874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1c815843ce8b0241624ef9050b4dbf66c4210b86d3c9e5399f7f033a19157. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEQ022281875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67cbb6056b5b7808ce4fb8bad88bb2d750e726b076f4e610511e6a3ea8ed66b. 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/DEQ022281876.