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 0x9bcf6a549f055edf076abe73765640121f38fb57faaaa1d19f997ec2ffbb3aba. 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/e4d76a25-f5ee-4bef-96bc-f6e5389c935b.json and https://artists.proofprofile.net/proofs/artist/e4d76a25-f5ee-4bef-96bc-f6e5389c935b.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 0x825c0d3a22261b2a4fe9981bcd858a114ab975ac5e749081d920d634f0fff467. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QT6EB2502963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6d723036b237523d5eef7da3b162236be1a31364ae86e1ac74dae5112ff988. 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/QT6EB2502964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317f5167203fa643f8eb779760964a2d57b8ac0a7a8226900b10f252a3e1bebe. 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/QT6EB2502965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6235cb2c5a3fbc5ff654c0b9f2193e1a56f3cb66b5fdeb291a6f8c9b453f8db5. 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/QT6EB2502966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba07d1dad89f422b562f1ece0d28c16e6c4ba099ed6050881feb2200d224108. 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/QT6EB2502967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609934d0069f95f35bd9efe42f3b0747e0f0f8dcac37fd8308e0ba0a27b8188f. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QT6EB2502968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc648c1bffd264606863a353a6e1496492ad9540dc49120995ef12ef1ecbdafa0. 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/QT6EB2502969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb822851efacc66cc9e6bd90109d3bbeda9e04c29e0cb083d6d5302d26c9cc5. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QT6EB2502970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a7e4f9315d4339d99862254382fb24bef3906c8d8ffee66b0419205662f44b. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QT6EB2502971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eb31714fa9ea7351681a13e419cf8d843e9657219d94669ac7e9b6b741f03c. 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/QT6EB2502972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0cab45bf6cd8511d7f4e99ec003464dfaba2f9557d1d859c209ffea1c6b51d. 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/QT6EB2502973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe957f8bab60ffa4612c5a451343007197ab60d2d6397af56bff8502ae69aa68f. 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/QT6EB2502974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1b93085c3795a26cc67afe03ac934a1a3dd90b60ff4087e6a63b45eb3f0d12. 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/QT6EB2502975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20ec35d8096b7f6627828efb40211b8a10a0058a63f705fce60f35774071c20. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT6EB2502976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9860d0c0da645131fd36b28c80132db3b44391720d227acfb29a505d1a826d8e. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QT6EB2502977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89892ea238cacdc57caf3143015f3def55c544fc06b0f1dc0cdaa931e0ada75. 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/QT6EB2502978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3012a42f62340db7b9797e57f8647bc93c1cd8f483aa6653dd994bc01a7b520. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT6EB2502979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd12782a9a46c668e1b28919a57fd1d92c42d0309203590c034e3d49e505c35. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT6EB2502980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f61a086f786e1815fa935c2b4d7880a8497fe5cedf6c8471880a0730f057a1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT6EB2502981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2bcc14315857eb1445104189bccaf7c58aebff32391cf71d51c4b96e3dc470. 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/QT6EB2502982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261ce3a83ab4d85bc65b33079041f248756c818cde8837a547e149a651f34189. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT6EC2590319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c753234e893d39bc2f0d581ebb1ec93e616dd38bad3f5223b5aca509d63f3e. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT6EC2590320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8b670fecd1b44179c7f3652b49c381e9c23fe51422a3021717d9e7b7b4cf05. Chain 2 (Bitcoin): anchored in block 957810 (2026-07-13T05:55:46Z), 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/QT6EC2590321.