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 0xbf870f986dbb8e5fd2343c7403b66ee8a5059339e2d198c7007d2898000fda27. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4e28759-a180-4c90-9b47-cbdb99ebacb0.json and https://artists.proofprofile.net/proofs/artist/b4e28759-a180-4c90-9b47-cbdb99ebacb0.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 0x932cd730a5588313783c8028c93cdf923b93dd0809b23385aaa0fa8b5aa11aef. 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/INV141100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4182163b729c62643eaeab22313503ab9573ca9ada91ed637f35cdde583e9343. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/DEFY60900277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3190f817a7f946fe7022e4b6eb5e898e4796f44adfc454d5ef4517438502d565. 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/FR6F31267550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb195bd9b42279581570d25a2ce75aa19ed536f377ddd97c4091d8322c181ae0. 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/FR6F31267560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e56b00b4324788c03e1df8954a3c761e7421ef26b548eb4ae8b9d7cfba3986f. 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/DEH840100233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8421d010ffc7bf71e2335b1f85915fd640aef506a8e928e3fe9ec039f09ce1a3. 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/FR6F31267570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2f0450193ff5a64fbe30a181b8c855d31a87fa02f3cd6832312e09157ae2fe. 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/FR6F31267580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253724c867140253113dc0fe84235c6541b6640adefaabb7794cf1d03a89148b. 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/FR6F31267590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a9b1b0c8e1fe19a012336dba3bd16ab57a158c7a6aeabf92ebbd8e18949b8a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEFY60900282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aac3555c2ddb22e4dd28dc8051d4178f3bbda79d6e1070b2db56ad541fb811. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEFY60900280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bf9508f66ee57d72f6e7e9f807dc7d70c98e8b666f9af8a08c6f37a3de8db6. 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/FRZIN1200300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b2c60750725d25e366be92cc1ccd3129b1db8687d63f06cf795f4747c3816d. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR6F31267600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef85e71c73f2e0c0b58e408383c39877c742c96191564c0e6c00861359b6f2ad. 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/FR6F31267610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8281f9ac45227cdd99192ca9abf205cbcf78eec3c9e8de66580de95ebe471b5e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR85U0100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829e29acb0c6b7341a1ef473121c12d964cc1f947e1cf80908c9bf43961ff004. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGJ1425952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1229dd44ded0c9d89a308345580df82d407a5a3c72e048c11df8d32b3831bfe. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USCGJ1425954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511909651bb37715c0c15a337ab4f30362e20b3313ae808b07f348ef003b6e3f. 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/DEH841600103.