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 0x52fddcbdf845fe9824aa560af7f0224ca2e6808ea9da637e48bd0033c16a3d01. 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/3509d21d-f1a6-4c8d-be9a-9cdb8b3f4284.json and https://artists.proofprofile.net/proofs/artist/3509d21d-f1a6-4c8d-be9a-9cdb8b3f4284.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 0xdbbf54207a0c5200abc025aac0953cc2bb4d19259bdf8b7528b78c1d0879b099. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USLD91726084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34a32edda03633a411f04f905fb130fbfd87186065cd7844782ed21b10927ab. 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/USLD91735502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b022df34854d99f93bdeacecc64cbf84a0c5181de5daf3431be0de92af486f2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USLD91735887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e19af5a524f8c0c4378e85f23533a416e6a2a8128a6500b686186e26df1bfdc. 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/USLD91738034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d018a799de0bae3afba8764e8d45b64a60445e32fed8d7a7aacbda97c342ec. 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/USLD91738443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9d57239d08099c5a9531fc4fe528387221e35406450cd3152a03d8cd136b85. 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/USLD91739591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7867c3c57bdef4d695f352222ab5115a8db105cb869b08c36f716382a52858ff. 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/USA2P2246580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31958d01d8f08878afc13e786430695e3caf4d32599004ce5440f499323708c5. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/USA2P2246582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f1ad24f78ede0fcf17697cfe0bfd6c6396cf270d3271592bd6726e47065fbc. 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/USA2P2307431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b35b3a0bff6917955dbf907d65aa0f261ede4a84ae800a81a6746a8c44f6f78. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2P2344018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f2674b95b308f80b75c6c974b5d8df0b47fbd138f0afafc26f4e468f21a436. 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/USA2P2404081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff55cce781f398808a01cb4c4798435cc25e80307f049e4f5edc34c16f86e6b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USA2P2404084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f2674b95b308f80b75c6c974b5d8df0b47fbd138f0afafc26f4e468f21a436. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USA2P2404081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928b101387c5e6e0d4221e7baf27b88ebc6ad1be21b212b5c4db3ae41563963a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USA2P2404082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb055cd85a826b620f7f64d4a6deed52e6e56a45e9e97fd2da697ea74fa7a9e0e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USA2P2351749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b35b3a0bff6917955dbf907d65aa0f261ede4a84ae800a81a6746a8c44f6f78. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USA2P2344018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5ad5f9cd76300723567e71255dab232914155373299cc8547104ecbb9fcdcc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2P2404083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff55cce781f398808a01cb4c4798435cc25e80307f049e4f5edc34c16f86e6b. 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/USA2P2404084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97f8a41299703b50d3e2896d8d965409773a38a0e8f292db16457c2fd881fe4. 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/USA2P2404085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db33dad094bf9d386b01929b8cf928680e2d631e3659b3dbbf206eb4705a974. 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/USA2P2404086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4940fc3c55a3e4e8f38d4c2c7ae0c5889f6b6719134f220a79b2873585286b06. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USA2P2404087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c0ddfa8a29e9b71a327584ef26c17ebb1b2bf25d13aebc2506d0b7c9564c40. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USA2P2404088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57e7a7fcc95cf314d7dff1dc37e0f8803e642f29b7d06fa5f11e0f8b05a7f4f. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USA2P2404089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b381a3c0f215c3e565f1efcce2fe0d2c1e8b377f120ecb2a406dc6165f5929. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/USA2P2404090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41147c257dab9e1db19dc98f3317f2d0d21fdfe62fb4fa9905dfd01fb06197f8. 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/USA2P2358883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12348f10b1001497305a95440b47b1dee93c669f755f18072df44a050fefae0. 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/ES5022301375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39adc817dbbe24d30b42281fd7722d36aa094424cfe6941feb58639d410fb0c1. 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/ES71G2338393.