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 0x1c98892dbe376bffdb1ce1a948ece42cf71fca5a07fe50c06f55b61aa0351724. 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/20f3df4b-3308-4cc4-a9ef-92d7ab20a667.json and https://artists.proofprofile.net/proofs/artist/20f3df4b-3308-4cc4-a9ef-92d7ab20a667.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 0x70caad49fdf7a34561bc04eec62fae43f38f27886da8a37f8b51a51bf80c1b95. 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/HUASY1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe72552544579d1e89127995958dde9d88a071d87c5c8586929310782fbafdf4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/HUASY1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30db314371afba9b412bd2083cdaca770fd88135f013147d12d1917e95694d72. 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/HUASY1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda3c3d0146c267e727b5c97acdbdca58536b63cf276aeb42bb0cf1b6cc9ea00. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/HUASY2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72961765632bedf07c959e424f9d0d9cad3af6564cacef0cc220b1fa6b3cd6f7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HUASY1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdc8d003147ee9060cb74d705a2eefd07d0f17aa0c5acb2e83bd97040ab656e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/HUASY2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1136afd396cc7955ed3f99467f0991f3c2cf703eab3842f4d4d9558bc27c94da. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/HUASY2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201ce4e42b1c5664cfd69fc4fcfac87e6971ebdbb1c9c2e0e95e8fd9488b180c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HUASY1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b29f3876883063ab32b8f970a4b5cdff138960ac75641e48fd2744683a54859. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HUASY1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea7ad369c3ea6671658d28461f4c1f885bee7dfded54cca8b438839276b3f6c. 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/HUASY1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5413ead80b2a9a3688ae87690371c383949e54a892b15782ced3f67c92fdfdc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/HUASY2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c7ed669ce2ee48650643793a703792d349820ca4d09e2a63acfb59dfcf1e4f. 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/HUASY1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90a4c719a71ac5ee991b57fcebfa360a001871c662a8d26d5fa76c7258f16bb. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/HUASY1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a4b1b16db735ba04477a62fce8e2d6481f3f59dfa0ff8583afc79b61f17b61. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/HUASY2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7bbdae5c9374246a853ab569418dbe1a9e839d52a72d22bda063e7994c5fe7. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/HUASY1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c186a252f7e271c7a4702f24351f52931796d20233015d51d14adb90fc6e45. 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/HUASY1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4e4707ce7efcc0abe455ccd5e4e8f2686008847187c82e9adbb1fcfe6a0eb1. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/HUASY2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1c383bd1a3c29576fba67b63d0ea464d8019899f7c45e0c5e23c3e84eecfd6. 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/HUASY1700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce22f86f783cafb02dcd56408d97ac452975bb0ecfa5a18bb335226c4708cfb0. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/HUASY1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8427d885d54313f2657104ee98d2438ed7f7005543df322b8e16aa4ff4c5595. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/HUASY1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e0d511a34be127df8f919e061b7e8ec812a70e276d64e81b0efc1bc4f81437. 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/HUASY1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b26bd8dc8e7f223273f664135ed85e4b16846f354483b85c794d5fd98c13eea. 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/HUASY1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195854f9a0d8af9aad69f48f23641160db6f84ec3d790082a7a1529b92320445. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/HUASY1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1a5321cde15838fc9a8122bb423aef0b6c45f33720b6e3f084cc13e2a82ef2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUASY2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d7c8ecd3329d2103f4f8c38841e5dfe910cac25e02e7347558a97ae6fc99b1. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/HUASY2500002.