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 0xcaad571368377df29ad8e88e4a354832d15ce345c5c79f2dc4b5c087f7eeabd4. 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/00cd9ce8-b0ac-4365-bc9e-03577e44e2f6.json and https://artists.proofprofile.net/proofs/artist/00cd9ce8-b0ac-4365-bc9e-03577e44e2f6.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 0xd0ed051c421f92f3bfda81af14ecbfd8336fd6540355871d177da7bf254403ce. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GXD7V2347908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3871ac3c5732a87d2f9933f076f953eb3b29ab5ea813dcfacfc464eb0d76023. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BK2242401187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a3e6b5e12a8d1abd7464de5e525b9c1ef453940ff8949f1df6df3eb3dc5123. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZNJW2461288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebcb28d1d2c608a80bcb4955b64d4963316c6f7e8d2e454d31940d6fe6f8f61. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJV2438631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2205029b24e7a9baac33f6e12ff54541c0f08dea177512e7173f302736d9913d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GX3Q92485412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1b09a46253bee74fb0a5b4cb3f4ff74db1370973477637106cf63de930ccba. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZ5AB2447011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dc6bd500df247c8475cfb5419a3ec539eebe79126adac750156ea5635a0d30. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCM9B2300291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe089b31ad04a466fd584ab7ab4051508f2bbf9e0e0009a13a70c5686ec597fc9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BCIH82203087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f2e9a1b7f855d571dc2a09b12098f0ce4f466077fead067c9a2360bddf2b94. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BCE7P2200600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68d7136e3ac609eb83830f350edd1ee19fe0035917f0fb1af6b012c6bd09e3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXTN22000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef6c12aa445434203845df87af5e6e84dfda30e2a2025885f2594b2ea7b17e9. 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/QZHZ32080211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b357e6a62e3e6870ddf3022912e1ba9dfc09b0b1c96f0aad4de809374110ce6. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BKFUX2301904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c72d625793de231405d550c0a16cb3bef61c72d5c5d9f226448abb545e2364. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SGW502297051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987adac5fd253a881b3858c77063b963dcdb12f8fe8c2554603a36afab8936e5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BKZ092400401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c230b61ffc7636a77f83a80e105f7ff00ad4e04f5019b02dff362d9aea6d33. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZW9K2410119.