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 0x79435b050a9221a045f0817777c7c9bdd49730b30ec5587c98867dd71578f4f1. 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/ef104904-4fee-4c99-85f4-7470eee8d4cc.json and https://artists.proofprofile.net/proofs/artist/ef104904-4fee-4c99-85f4-7470eee8d4cc.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 0xa131e9c3e81bcf9d29aeafc8bcb0738f67cb2580d5650624cb6faff88086b43f. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GXHG92507577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c617e28ac433e1ae2553cc4ccac2a9d0dadbd09e9f1f2944c854bb9129df63. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCAFC2011276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afa42937c2d6b138ec851cd8c5860b4448ed76c1bd3d37680cfb0fcbe6b104f. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCAFC2011278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b0c55d14d8df877876803a6e18538a31b3ca66624b31ba754eb42ecae87ab. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCAFC2011280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de2ec4d1fc5b22e8170ab5377f4308dd3e528e96aa455d2d7ea9871f8f3ef6a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAFC2011283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a0ea4edb12561d0c065968e7fa9d6a72bdc60758277e139d3ab181bc72d07c. 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/TCAFL2138687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52a59384c854482b4f0ea486c161f2bd3cd9387760dfb6d7acd428dddf1d31b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAFL2138700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eb7ee2d40de5180c63ababec540b2acf072bced5de275dd803dbe01c5720a9. 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/TCAFL2138735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f4053c8bd54b53800d1458149b0dc646fbc4badecab0a2d319e74cc89f5c95. 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/TCAFL2138774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad820639fd8a18f3334570a2e3c91f73c68c8254c65edc2ba267497899488bc. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAFU2164647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769492b88ae29d141f47b9890cd95a645abc2c35f46edb0e083f5ac5624ee9d0. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/TCAFU2164674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306214994c958e808a5b461202f847c37ea9fa6e244beaab6ce060d89f9bd7e2. 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/TCAGC2241073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425fbc6641876d6caec98cffc735ff7242ab9825602f6982605108fa9d3dfa7. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCAGN2265432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a729c1b0077decd8eaf3de82c01244230ed5b3bf2570501ecdf982ae569bb85. 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/TCAGX2363019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce438290c24c47039414db87131daeeac5dfd5ee3e4ef1b0a9362a039818400. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAII2469203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a754aa4b1c0fbe25ed9cd12b35302732029426ea18334cad7b9390aa8c2aff. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/TCAIS2477681.