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 0xd759aaa1a02eceaa9c811c7304f91f9be5eb94408108a1fecbda186be5555605. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a97f70f7-e940-4094-8637-9baebb3f6bff.json and https://artists.proofprofile.net/proofs/artist/a97f70f7-e940-4094-8637-9baebb3f6bff.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 0x1c980da088723a81db8ce99c655679f6845fb986576c4f5ed1b390ad092d60f1. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CZUM72300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf90bdec6c90b033d5c65cbac641b00b7155b7992e3ad6293ddd33a3faa3b08. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CZUM72300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d00e7ecf11b24706a4d636a033360686e9eb3725444cfdaf866ce99e5d94a67. 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/CZUM72300044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04efa7cda225e749e356a60645fadf05afae7cdb5bb5809b085b5579d0d11b5. 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/CZUM72300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6460b7f905cd9f9d9b0c7ef52ec7dc81892b62b896a80c8c00f061f899b37577. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CZUM72300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc32b16249e0da3785e986b6d04f7777b5e06f07dfa25cc61849d099d976475. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CZUM72300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87669fd6d4f4d9cd2e84f16dc28cf552d2c0aab7ddcb183da5537932f4351399. 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/CZUM72300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b0f4f48f7a2449ea03d2cc5012f921f58ae05d334bdd21895587ae19db4388. 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/CZUM72300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cc034ea6c516b3c3c5502b2f56b112f7a974e1bccb772aaf5929595b335a3d. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CZUM72300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcfebc37d941e37c203fd86107834badae939b58e11778d929925b3aff5c2e3. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CZUM72300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651c362a506dbe01b678440d486ab7ea51de56fea477aec6a328534025228300. 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/CZUM72300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003285f841c80bb3feda2ad73d626ff0b584cdfe421041a7f5f387d88375c877. 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/CZUM72300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526e2719eac80bc507ab4afed620ca9cb5412aff9968f200a96b93503dd35bbd. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/CZUM72300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e9d21bbc53cca3c7632df865528bed5324748d1df464b8d24079295051ba68. 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/CZUM72300055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b375ab4917891131f253eb0c4cfbb783b28efb7b5e6ad1c12ed0865146b37ee. 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/CZUM72300056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91be1b7f64cc5e6d93b5a68114be75d52eb50ceb794306e11140f3ed983aed2c. 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/CZUM72300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353a5a44e50c93019f61d95fa212b922bc641355ae2af6e8d4f7160b31506cc6. 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/CZUM72300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3e7b16c6a3e2e629de93b5b370c41888ea6fda71f63e7de407ae906a916c5b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZUM72300059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9558d7a94ef0d4398b53ad18d4eec8efd76d98a2bd246487888b72ef4d3704. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CZUM72300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abcbc0a0a44821413096878e66aa2f18b87c3eaafa0e36c5d9644d2af656787. 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/CZUM72300061.