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 0xda5fdf0e6004078680409398718150771f7389d295d8f81cceea5c28bd929030. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5fc1f0f3-6874-481a-ace9-449c04bb37f9.json and https://artists.proofprofile.net/proofs/artist/5fc1f0f3-6874-481a-ace9-449c04bb37f9.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 0x070424493c8f6923b60956b705f531e45392802bc110e462d773fd844281b29c. 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/GX53U2448103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e1ebff56cb87bbb0ad732b7464082741c016a2d1cd7d48cac97ed4a1547871. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GX53U2470893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1dc8617e0b92ae338993b88a1cdd6a63e82df2f03a5b20845804ce337759d2. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/GX53U2494228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fccd55c73d05a0b6a251aaef8704c05067c5ddd27561006b7e57cc0f04f048. 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/GXF9Q2508410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d168abd2099d675af6a3e42f18c2eb65fc0f02a19ad528c730605a553f62e8. 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/GXF9Q2523851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1dea83763f9d620ef971f7772f6b2dcb94f5b78046e631276082b97b2431c7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GXF9Q2566671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9888ed6e5bddf1945e08994a8b4f34e3edd878799f5329b8c5fe849b9fee5427. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GXF9Q2574719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1327533d084ca636213780b3c4f6a0f2ee855119cf295c1337936b2c5ffa88d3. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GXF9Q2586214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe872888713aae23f61275c6a27af4f0bee6f544a1d64c0db907494822a1ef8db. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GXF9Q2597620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6584f70e3598d78373bdd8792af30d626dd905182454e44f8b1c1e71abac65. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/UKXN22507063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fa24743b85fec42aae687bddf31d37ea58880adde8bf0ebe7718e2580848f9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKXN22514591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca2f2e9f8e70927f6c74b6297656c704ba04bd128465d6b6e6d00b68c66996d. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/GBMA22573378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879ac518013d38843ea4665761fbd4e2072b1a6aa5bde55b6c911c6816ac7a93. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/UKXN22519859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f84ae2ac182e9bdec229024a97f0b0a2368efe5bbc99842f40d4abb2784f92. 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/UKXN22523537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf91db518567ea689f61a47b93b1ab8bb068eb698a0b8412b448708a5d849f6f. 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/UKXN22524850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b9f42fcea875bbd5250dd7b25a82158ba209636acef89692a177c30bf3e11f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/UKXN22532924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0775079046a6cec3afb5a6423598218ae15d6863cfec15f5224186da495ad8. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBMA22582626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8aa4bdb9cc4d53e6ead88f30521c930963f7f37dc35bd217bbb78ac10a257a. 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/UKXN22546567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26059d0e37df9b817dd725c923d06fda95ff36ed807070a3063e91c7d484a1d. 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/UKXN22563955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a8e26e2ed7827354002110996e5b1b5b28ef6fba6a487fbc11b4018d065b6a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UKXN22567781.