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 0xa86d1fa4ecfd475d5ddd78883d905593c7981d5ff55326b3be129edd461f9239. 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/7177d57e-c3b6-4c49-9fb1-d75f877afa8f.json and https://artists.proofprofile.net/proofs/artist/7177d57e-c3b6-4c49-9fb1-d75f877afa8f.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 0x294d748069a4860825d3da5610af6abfdd76177492483ac4be425529794f3e7b. 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/QZES92099489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fe7baec5f311f60ff29762fab08626854b4ff28b7094326bfff93dda40e16b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES92099493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78483ad4de0b8c4bcad1c604ca224617836541b5ba6edb879ce6704cc02f89bb. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZES92099497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5237911fb070bc11cfcaf3ce423751ff235faacaa1853611fa194baa9fa89182. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:45:38Z), 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/TCAHH2394421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1bfd11c582357385a4353bc9b895aeae7637dd05c7eb5a354badab3299e79b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS2446714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b267a6b3baf6716e9c02bea32142806ca476ae85398ef3e159d79580a873529. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTPX2403047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe0e9496d0ff2982870dcdce91b3ca10e9edca2c58d0072c4266684ea999a1b. 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/QZNJY2306240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40009e27f314a112589bd7342779bf1c121499faef09bac6ed3c6484af1d9dba. 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/QZNJX2303702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ba0ad9f16eefd672f88a59b820c6ccd4467c936abea593870b2b9769238688. 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/QZ5AB2428882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaadc5a6332cdba4353e45bc31741a20506173b97ac42f9f4d382db48508e95. 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/QZMZ92372341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee44bb21016b369bca8c1f13685c1314704d6180f28542f7e1f6167ba012c312. 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/SE6XW2186819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1657896ca7c5d0652c8df3118e647e4ea32017011ba9df4d73c563ab14ce8e79. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJV2418785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65591c932e92dee7c4db974944ff8d5cf27449eb76b51f6e3a6999870339088. 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/QZK6N2266816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfeac2d7945c4ad40e15720ad1ad0973d43263f51e4c4a3d895694046173023. 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/QZNJW2470623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c21ab1add5bdcb91d8272026032541d7e9b44392b692884619449ac7d3504a6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9K2442309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80ee44ff0b17e7f1414b2b6afc6bd71a3b609e1414f9545066a301d071e9aad. 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/US7VG2513968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a148d2186f576dcc6b9d069543f49aa3e4d5114f4f0c7d62ec7538292951cb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZW9K2423722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692f1816051ba231b35b83e3df7d8f0e4224a85c983bade0906c1cbc6e131b56. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJY2430661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c3c50aeb1cd3c193d3df771c47b4fba51334674bd172e2023b7bd43b21c548. 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/BK4DA2323475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4b0284201fc2deafe6e7532e1c061d3a9595ffe6bd946b094e863cd7a73cc6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXA0X2500018.