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 0x129dcac13d83ac33a67e8f1260fac44400fa056339f360e7a16ac48380cd9e2a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/283593e6-34ac-4a01-b99c-35f604e3509f.json and https://artists.proofprofile.net/proofs/artist/283593e6-34ac-4a01-b99c-35f604e3509f.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 0x3de4a4d1ab23a0480264b4bed0e5a66bdc9d2af718137033e8a70fbd9ddf3051. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIZ2477130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196eb19f7dc84f93e8bec829c89e49a838ed58a32b30015aff0b0660c28c3bc0. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/TCAIZ2477133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf01761683631bc263103f2c6a792e23b69d3afcf032ab91cbb11fc15d63230. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/TCAJB2477137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31adcddf92d14238ff79b9c76b2ca512527417daaab367e89ddc08f02cd6ed78. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCAIZ2477141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e63d0278b9d504a5008c96a7f9fe76bc24a5ffe9b81187d6d331e165c15732. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAIZ2477143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38748e8d116477533a8d3a4bb16ef454703ea9cba449dc83e0ad38e99decc146. 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/TCAJA2477150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa3d57b8f2f3fbb805a7cde8af996045adf6dd02376f16fedf7eac92b9d16d6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAIZ2477151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa18c525f68cb8ce1be11234dcace15a77be7cccfbc32c2eecfdb72f21d3e91. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAJB2441369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bac32262258958107e644335180ba386017df3067dac3c359b8b2d9f1490e3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAJA2441373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac72d6a645edffa362b086014d447c075024d220109ff751e4bda93942a3d65e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJA2441374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6412a76c031f844be332f5c897bbaf678e9827818b819926f1c030ed5c17c9bd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAJA2441376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf706ab505a276b6a36b24c457588d3c6cb9a1b9760351664a968f83ccc2c4a7. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAJA2441389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4309f78e733d9c8f378127bd30490de3da8da44df891e830740805b999847ba5. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/TCAJA2441464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d00f7ae5ca44d27fa21a23794f90bba6671617a3f8f254266001a23a97bfe0. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCAJB2441468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b067507fdd07fbfbb7020f8d8e0f488e137fc60ebb494c0218b87b77662346a. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAJA2441470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526fff5b2159a1287b8dc0e4443978e27547ef4385df2b53038971768ac7c32d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAJA2441474.