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 0x752c2f947eed80ac84c5cc51b166fe8154f87e69f5fa922a116a1bc0bc6e6b3b. 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/7bc06ade-5a4e-4c21-afa4-16d10e8ab637.json and https://artists.proofprofile.net/proofs/artist/7bc06ade-5a4e-4c21-afa4-16d10e8ab637.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 0x297629ae1e8e8a1b512681cee7dcadacbf01945306527cf2a99b749cf9a06ed3. 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/MXF551104203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf243bdc1bfe06847e5b391663c2208c5167858a0b2489476592af4010722bd9. 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/MXF551265565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503a1516186d78c86ef071fbf972817e46947b3804e4729cb1e581e965d91069. 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/MXF551265566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf821cb4a830eb425a4f3b21f01a8614beff5728b7772ad2bdba5f0524f8a7de8. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/MXF551265567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781698f55bb352e063ae727fb3105b6cc1c9ffb61df5ccf59851aed03be20ef1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/MXF551265568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c041fc55c698f698756f29399871360d3c394188b5513679d1484630e89a74f. 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/MXF551265569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb80691d3c9de49621762e76f889affc8d2c3ab903af571c355e7a80452433ec. 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/MXF551265570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8aed2ceedd16a0094653490387c66bd1da73c5636b855ff1d60945ee73b6078. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/MXF551265571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda7f5806904ccaf4191a9fe45c99c62130e96f5453608a21aecdd8a137e3b96. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/MXF551265572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8763eadd32ddb2fc492e83397f727732fc256b2e597c2be80e0d6c91c1d79c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/MXF551265573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e085ee8eb61f8a9bb536d5a4d3311338540ccc69210474b9ae99e3e94f87e42. 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/MXF551265574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cacc5374c0e8f18930b6febe9d24e8bafff7b6e1150e30ce383a4caa9a6ab9. 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/MXF551265575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2acc8f1cdb54bd4541d5c061bf47c0817eeaf2ba1c48fa89db4e9d09435004e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/MXF551265576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75abc81c4f897927d077c50a746535c8f411a8bbfeabfabd09ef59437129e8b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/MXF551265577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e15e521e7909bb1f45501791b30f2f8447a11b80da46b6d21c582d0c2182a8b. 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/MXF551265578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a3db294b697d1889102829b32d6ab0eece41bcb6846d121926f1524bb05ebe. 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/MXF551265579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b0d73ec8c6d2f2e8862276eae91e12702c15ca6b2c8a75f3622cc04f63cd31. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/MXF551265580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fe8b8d7fca43eaa8c98f211e9324e61c8dd5ceec33c05dce926b93cb471b92. 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/QZGLS2004520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d31572bb6fc2f5974d034f7d65209491d5079b252909e9f9a82334f3534b271. 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/QZGLS2004522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b7f3c88657279c60e1c2ab9bf3cf06ab3bbd99c9b3eff1526c1d84ee075055. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/MXF550812783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a5bbb8ab0f5340a6fd42b0040a48ee106560b0cc6e47f0b53df8190e5398ef. 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/MXF550812808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc455ef2ad5195b7215a76a18ce3c1dd4b09160ea8e11c292ab5180d4bee097ca. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/MXF551204567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf704d6837abac63f071039c291f315cc25704619cb1e3b3be1decdef2628ea26. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/MXF551204560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42826ae0beacf1cf6c9801560707d70fd1d64faa8ef8f60cb89c42556c6d94ee. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/MXF551204554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc6aba4fc96539b92065e68dae85e7cf8a2837bd6bc7f348e3583fc1a8209e3. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/MXF551204553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62b36e1d2323c5e2072bb843caba702800f70cddf8fb98a72d343c04eb49a28. 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/USJE62101048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951e27549300d0eaeeb6532b42bb85b1ee19be8a35aff5c3f5557f4c7be20e49. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/MXF551104202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c4062cf3ab631af55c0bf22f2046832951a90d8316045a41be6b643dd45578. 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/MXF551104204.