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 0x80f23f519a8629898cdee863d3688c50351d732c9e941a1797faf2b5797bc111. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c07eb887-2b11-444d-a074-f2b902e779aa.json and https://artists.proofprofile.net/proofs/artist/c07eb887-2b11-444d-a074-f2b902e779aa.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 0x55c2e5c5d44d36367d2189a14d7a6fc386ad39e5eb54b1d98120eb192282df49. 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/KRRAR1612250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbd9ba7ab89c5c711e5e843ad9a25b5f60490e0da71bc90c35629f69d3afee5. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZZ7K2425413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef9e86d750d9ff795835281c3fd622db5125fb56bf8bffe27aaf48628e60d2b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZZ7K2425414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2074d68fac381e3582cdeaf9dae0b349ecfeabfede80fa6c811f15bea8c55b46. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ7K2425415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013a9cf61dfa44db7a33ceeebd49d51e7659295c1567821e7ffe76156f7d219f. 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/QZZ7K2425416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b724e1481e069087ccae7a4ebd25115416d6888f4f79a28fefc74da1c6a23c0. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZZ7K2425417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cccb18bff9da27c2c2edd899e00ea1e0f4205aa82cd30c10f3aea26e70576e. 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/QZZ7K2425418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c86f6dba25de3fbdf36b643bc82b84079a8b7ac2772378c7240c2de28c9c0e9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7K2425419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a8a0cafc7c550edf1ba809dd7e9f6699b61ccf49ba9e51cd93ed0df720202f. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZZ7K2425420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3acf0101346be120fad57fb36baf420f637e50f6c47a417bf92e0e1367615a0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZZ7K2425421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd8e9a1e3a50fb70ab9dd462dd39979230ff499b3dfb7459bb42543231be0cf. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZZ7K2425422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f16481a80d7a7378e24066c099713478931951cadeb9476e79de52fc7afd4f4. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZZ7K2425423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c79bd8124ff4088ebb53b9f50c7eeafb1ac65407cafc768a90ea251d05a70f3. 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/QZZ7K2425424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289068aa8a3b53273ab8f82703901ce88babd173cc7f56a4511c732a728ad78c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7K2425425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044d9234391af0f3c0d36a44030edf64d1a49b4d7e9c2efee6e2e2c9924f97ac. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZZ7K2425426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68ec674e0c3a920821215325df945db0f08eb7c1288e7604dadb732a131ec7d. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZZ7K2425427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b577a16cebdc1c6849f501ecba1154bfb2c62699d9d9d2c88cec7f555c542bf. 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/QZZ7K2425428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eba1d6089044255f1e493636a21d8be9a5ba318019a28454f83abfbdac760fd. 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/QZZ7K2425429.