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 0xdac838ce17a8234023002238475a81c1141c7784f614c4011a6984fb7a22390b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45c10664-a440-45da-8258-4f64b55567dc.json and https://artists.proofprofile.net/proofs/artist/45c10664-a440-45da-8258-4f64b55567dc.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 0x7ae1ca08e7378a6788aa70487c41db533ca28aae8d88c2c814f0e39ec0ecc81a. 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/QM4TX2452070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2064252d15bdb05ac246ec3ed497c601db5156acf23d30634df11f4a64cbef. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QM4TX2452071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848f57f3f3a0ba8c7df634dc903a2c967e4764f102ef2a173ac3af27695051cb. 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/QM4TX2452072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca2b93240b406a6c6226b9295d0cf63fce93acdaa1c9d5e65e16a9980966ea0. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QM4TX2452073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ea752cb1dad9dc90f244e4ea92228451dd7ac47388e80efa98e65ddeb0604e. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QM4TX2452074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088e5deb9fb0b805a83fd9ab0f5e5a1c7144af25005e3323a0197bcea896ffd6. 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/QM4TX2452075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac6baa48a9e006ae4b81924e18d750c89476b59f1919ba1fbd2783367ea4a80. 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/QM4TX2452076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a69acc8ccd714b084a6bbfec4b419fe138dda17ce2149de6df0ea0481dafb05. 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/QM6P42190509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d63ecd27d96e61fe19a3433f9632f586c5842ff6ac22eb34ea47a4452e0b6d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM6P42190510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8aeeedbd288bb88fde212840523f1f88c37facf72aa0441f7ebf4755452e59. 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/QM6P42190511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a295585f325c28993c6b377a4c475238888c95e9053123cd4566ffd5d8fb593. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM6P42190512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418a7f3e666080d463c195c3172665fa16b515e6fd92e051d54294d0b267922f. 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/QM6P42190513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc60a1ed11af3bf67aa2f9252758b49eda9191315a15d2d8a7ad93e789ebcbc. 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/QM6P42145003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10667b98b3f10c98b1ab9c5bda6c74d76e73b88b0b65a72016b5935f2bae6bb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM6P42190515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a5f2278abe6e81b1e3c4c927f7a7dedf59ea5685c34dd0b10e96c5aaa3681b. 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/QM6P42190516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae1ca08e7378a6788aa70487c41db533ca28aae8d88c2c814f0e39ec0ecc81a. 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/QM4TX2452070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc60a1ed11af3bf67aa2f9252758b49eda9191315a15d2d8a7ad93e789ebcbc. 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/QM6P42145003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd3b3a3322294f1c317abbc90999872a45d17ab6e3998e90a8632d73a61f388. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QM7282320326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee44645b3b9b069fdd19afd0e4f726528f1193677b51a6e4df8eb3a8beb2bf4. 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/QM7282320327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92d827e6f7779a041178714cc323918d7f0d9b9a363f1624362b0ddee795de6. 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/QM7282320328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8772f524674c61579c477b260de061793b8064c5f73fadd37a4df465397c1621. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QM7282320330.