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 0xf760ee8d6158735fb13ea602476a16cc30a7aa6d1b58db3086b3b22076306d8a. Chain 2 (Bitcoin): anchored in block 953794 (2026-06-15T13:43:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0cda518-9bdd-463d-999c-ef75290c778a.json and https://artists.proofprofile.net/proofs/artist/e0cda518-9bdd-463d-999c-ef75290c778a.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 0x1604bb1c0403db21218112a37acbb219262da70058fe14f6d49a714654a19412. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCAFK2158917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583879c0bf0be4096b1d260621732fbc6734b9b103535ff303d481f640ce3eb5. 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/TCAFI2195206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50aff6b8d0e66d95a7eb322b47d75f5c0d8f137af29268c8769a272f7404b328. 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/TCAFH2075245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48096831aad8f64b24aff5bdfcd146f5782146367b5f51bfc8a8933c003742e2. Chain 2 (Bitcoin): anchored in block 960165 (2026-07-29T23:29:40Z), 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/TCAFG2018537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b2989a8587baae6dbebc3dd4825c05b22193d5375857cb38884952941fd53a. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/TCAFE2038967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d578eb772484e25542a8cce41340eaf0d1ff13a713ed6dc0a389e7c31974c77. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAFC2087912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3124ca50100ff722ae1bec4de11ae87d62c5ec6c09a9f8c9529b2fdf1db8a02. 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/TCAFB2069402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84101be3a164dc3f4e2e31d4f00e0c389c8389a8d0d1375b648c87cd35c07ab9. 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/TCAEZ2097790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f08ca4b0d1017adcef035aed4698b32543b1f957e9a7b8ad1eb70c083b4530. 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/TCAEU2022352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184258e4367927182d0fa83f61ffa904b275ca7a8c9a8c0053ddddf7ee4e9754. 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/TCAER2069375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d66d1dcbf6ed69cdbd09e9c11dd55c3851bd60f4815b1f48cdd6261a36ebce1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAEP2065216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84680e5a66e2fe3aab0f327fe54e4a1bf4cd3ee25a517db252fcafd56db6f61f. 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/GBSMU6945679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb519169cc0f913dae1d333c4cb84b293a3c7905b6dc299b889c0bebc351bd113. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAEK1976043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9974cf7517784b641be0e7c989d2aa021d529a5ed3d4dca24d9bdda591447466. 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/GBSMU6706862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8dc22911bde0c8cdccd4ec124e9176c04e329fa8d4341dba2559cde35573cd. 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/GBSMU6683532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4546184db32f678d893762a0a751d8b0647f8a3c2d0b9c786a722899ca9da9f8. 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/GBSMU6613940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18203a5c504e515213410675a4db0e18ffc3569aa885178c03770dbe80c0dd10. 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/TCAED1934909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb785770e1fe664b3ca7ce24e38dea47dda7eeb390397a94bdddcf52ac7fb2619. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM42K1926183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e427c4e2e9066fdd7421220d4a064d557ef4ff31f3cf60170a062fcb5dc4e6. 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/GBSMU5849133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf861b635b68890bd3c3a2b86d9103dff175aee44735b16370b764feb4a20a4a6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCADK1739849.