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 0xc37153b255f1de1acca657a98956bd2b716eb94c84235468018ed38d59495a4c. 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/9399df2d-97df-48e0-bf78-72b2adb6f0ee.json and https://artists.proofprofile.net/proofs/artist/9399df2d-97df-48e0-bf78-72b2adb6f0ee.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 0x9f399aa4689d898c1de54830a0232f6692ec04d3d9d057ee208af449d91094f3. 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/QZK6N2489149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412847e50c4f1627e5dfa8c49783e25e48e791de180d7c5fd633483248e9cf8a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZK6N2489150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe05c755e25c9186351e4b8b45e34bc7b5c1ee38f043dde654bf7b232eb97f06. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZK6N2489151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc421bbdbf4b92ee67c7af7d7664079a56a02beda47c0062565078802ed7caaf. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZK6N2489152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5022bc1585b91546d525b1ad2cfc6eeb6e3141c39aa67786220edfe2dc761474. 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/QZK6N2489153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b06668e10c535e359cf7fe219be4b5ce5550295cc7c98d926af8e1e6fb076d5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6N2478496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e80b5019f6cb5ca479d4f294cb94fc63b3190319625541091806e741dd170c. 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/QZK6N2478497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3fafa682f0677cccc6bf324b5ef205a255b7275e5cb6f5d3cc2c58f79ed553. 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/QZK6N2478498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715f07edc1cb8329ca45f558fa8fe11f087881b392dc0ad0b454c8151d153c7e. 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/QZK6N2478499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198a01bc5d5a10a859b68b186ef966b81665f64aa7b7c87f116ed27dbf2a59ef. 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/QZK6N2478500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96329156a66663306a68be4acd361a102f666627951220bfa30f772dcca6032b. 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/QZK6N2478501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4a662a5a31fba23d2945c6e625a8444fcb2be8370b6fb208935802ee126c81. 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/QZK6N2478502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9820395cb7aa23647d7ec3f7a8f0d39e2cb497738c2d6f57155272617974b56. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZK6N2478503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9765696b6911608bb5164315ac30db7e6309fa67bf41aec895af97dfbb95fe8c. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6N2478504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3365e7aa75cfa9b1e2391bdfdb4e38359e8be402de485a8aba9f0086ee1f8e12. 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/QZK6N2478505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aeac6aeb2a3e1ce281d38ecfe45afde2e333aa0728a4f87776c26b99fc3f636. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZK6N2478506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0445d18942eee597d5b5e4894ca94cb1eb78cc0ac852c4d988b197fc3b7a0e29. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZK6N2478507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0438e96597a701559282da41aeab8fa871fa71812bd3c01ea579fb8eeb35b29. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6N2478508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a989ff5f41356a60687899efd9a0d2646061d213bbcbac0b8c02a43d910a14. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZTBA2455738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af39fe21986bb7afeea39c476cfb8d8659cefefab490eb56a583baf089c0e57. 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/QZTBA2456905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd773fe0b64d828dce78d4983a566575191806b350c19e0d31afadbe061c610d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN32555668.