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 0x98f495bc3fa8d63323030f681c7cce7e22da724067d63df81360e793e923da73. 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/5961d029-816f-4a69-b569-db5b9c4db051.json and https://artists.proofprofile.net/proofs/artist/5961d029-816f-4a69-b569-db5b9c4db051.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 0xfa6194da4727dd411f25492f1e6da3c09f9b5dece66a3266c28feb34afcc841e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USTC90958357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7f09a87c7dce8657908c50ea6002ecce025e283f2dd12922bc45c2d81b299c. 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/TCABA1148933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61286a046b8962bf26f4408db2db4f48f0370765b5390f49f1677db26d9b8c1. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCABA1149003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893e72f9e981ac8011359c7c251b9b4007aac50ba09195ccbb56d39388e5fe2d. 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/TCABA1149021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb6d68610069bd8448231a05b1bf757ce9d6c1bd50bdff27ead963fae18e6f8. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/TCABA1149078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec1a5af98dd724820da77a63d330787e6a3be789f0d945ab94ef002d97f80e9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCABI1211608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5d27c7845dc17f691e440887350ef3a4564530330edf437157a363001f43e8. 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/TCABI1211626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784df9184d2cc7d1a190cffd8cfa03ba53e43c969bfc957e7521fdd6697908ed. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCABI1211632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da6ec1531120b12bd302704b89f0e5bf24fa04ac0e2c370e682475a2c12a3cb. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCABI1212280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c71eacf174c34b1f3edd4171abc8aef3dc18526007b343a9237f8b6435a292. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCABI1212296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9468ba9cbd6d94162be731229d5cda39743e21c99d5e17aa94dcae00fe0ea57. 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/TCABI1212331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe789b88365e047f0cf537e018f985df0fa65b86dceb1d30f38b235481a2a7896. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCABI1212340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf6d27c2b151cedc7cf0b49b27743073733236be6350ed07aea9fba063177f3. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCACU1632190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d502c2f826efc48de30ea44d01786e04a2c4938b6da434fb30c672dd4212b2. 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/TCAFY2125780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e1a6611a35664fa00e920daa169e636793c71bc667ed6899b1d7cc27cf0a83. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFY2125800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b68f7017113a7f8fe02e681c543f9a18d366841a794343a5fa2eef3e00ab909. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TCAFY2125814.