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 0xfdf235f1ec929f28622e87da43418aaf9b1650cb0f67d67e74bf8839f1d9e88e. 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/0c7a8a98-f073-4b59-a4fd-94665b85a380.json and https://artists.proofprofile.net/proofs/artist/0c7a8a98-f073-4b59-a4fd-94665b85a380.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 0x43026422b72f8d096feea229d28ba0ba83c8880a6f65ad99420c5d6c1f1c0403. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NL1AP2015759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d76d81f0368464b3c1dd70fd9ea057996dcac7c4468283a0dda55ba8a55354. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL1AP2015764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43924f33b1592e9d2c6b9774aa49b831b5ae1f8e4164efe5843c2f45347e3f5a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWDD2237981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896e0245b43e5457bee6e2a7423e2368456b9db0bf0a40ff34d35a40a141a64f. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CAN112301921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7677c3ceb92a372790598ab60d22d516516901a095619caa2f671a12e42b65. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CAN112302050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9303a14a3078cd992a8c7d3fabd8014ebe8495895deb75145834b2a7547f3bd. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/CAN112400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499a9c315c8c3db452120082c0b38a73b5b04f357b1b71d324e03848d0afa1ed. 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/CAN112400469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7677c3ceb92a372790598ab60d22d516516901a095619caa2f671a12e42b65. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CAN112302050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015359f65acdc6fb3ad1a96b2befc6c338e141a18f6d8d805571b17f7e613bef. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAN112400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7df943cab803d416fedd967f7ea9cb0f27b09eba002b80620861ec52f3e0262. 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/CAN112302138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0bafb6a54ac081033c809340cc7389ac40ae58b443a48cf8ba230838fa5eee. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAN112400363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381cf8568a0402ed61a4ee8e57fbc408250bc5d085a7ff63ac9942a81dc99e48. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CAN112400470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df438f63b61a92ed22d8aee21de942e04fbd4c03d18d17991583b490ce48b38. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAN112400471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896e0245b43e5457bee6e2a7423e2368456b9db0bf0a40ff34d35a40a141a64f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CAN112301921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6785bb3204f4dafd2b3035480484f14931d1c1b08f47a4a104aa517cbea41bae. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/CAN112400472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb8859551059da6eecdb082c74460f317aad5efe2c038b777963bdc8bb05417. 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/CAN112400473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8da55d1d19399a99d7b639f06baed0278a0922e473d6c0e256bcfdac6af4293. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/DEUE12481808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84b4240687457614cf996aa2164d89dd0a44980d6d0eb254fdeed309170df02. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAN112402610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99ba1b11f8fe21fb83fe6e893e381daa4dbbc5128314c472c266de929d71ab9. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CAN112402617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b82c7370011965b65eea2cc38a4614726f4318a032ba6afc4ff231b61eae0a7. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CAN112402623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c29b72fddb95f37977a5f94b76e881c0e7a7d60649d64c7ec878b953fa916c1. 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/CAN112500267.