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 0x3c78894164f00b3ea45988a036589afd66460dfb9124343b534c9c73a6ccc79c. 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/65278677-b529-49f9-be9e-5ab1d3a3e3ec.json and https://artists.proofprofile.net/proofs/artist/65278677-b529-49f9-be9e-5ab1d3a3e3ec.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 0x299a2b87375762391b5197fcf757711e443a4bac86450189bc44dcc1446fb328. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNC2217786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4fe15781ff8cfc45b882a46326e6f72363facaf56cf56c861229f6b1829105. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHNC2217787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3ebf313da334bfab538b827998e82faa0adbfc7c9237b9d97bef613ce04a5e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNC2217788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf18493fe5139c6032d2f3ff36767623d23f7133d432213f868f8fd6c6d3d02. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZES62348705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c5f1627cbd2fed2a90ea221bcd14721dc4555a9f597fb54fc9f42244f79899. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES62348708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb587e2bbee229fd31c8bc8e4cad511ca271b76bfa3c00b424d716125af0ac481. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES62348709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8e5b44bd0e8cc44787e4871d9c43a21ac12cd7243155c59e418b8e2edf1e0e. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZES62348710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29cb26e0de0ae1989aecc04d69fb42409f6aaa48a99b6becd0b68fab422b1c6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZES62348711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745bdb7bd716a71416ecc977ba42a783ae86ebd4cdb1efe48b06481d2af9928c. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZES92362494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3f7b75144803488a6a38ba7bfdc2e8ddcb0a6efe9b3236824d326e3eb856bf. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZES92330032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8df94faa48e3862588075ad023ce61e94fa015949a9ab903a505810421a29e5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZES92362497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ca8da56f7b7d965b6e796c4985306f36dd72880a0ef31de21b91ec2a6b1e31. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZES92362498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9542bad76a175e9507497532ff1a6375d87c4c6e73734e316708c1a7cbeb768. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES92362499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fc0e256a997c3c594ebade1baa839f232e5c8f3dcebdf68b2fe243bfbbf925. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES92362501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b47ae024e1371dcde1dc22a11abdb705efcf3b8b5ed71856382f2188fa7879. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZNWZ2376719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f01dc6fa43bd8c8aef746895c6943a5db7ff8d83ddfd2f579082663aa028b4e. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZNWZ2376720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbb0008fe8ad8e82894e0b7c61416f9e8d6ad78a713e348a3b4809df4ffcd97. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWZ2376721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ed448fdbc757bf31f2de0a746431562884a38d782e50ece015d6f5b21f8151. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWZ2376727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c512a1ebe7b6a21f4e96f2ef701de84f6b6888fb1725576688d10f09bf3e5fb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2376728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37baeb94cf0b15cd31d38a30549b2ce694d335bed1cf121d652298263003d42. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWZ2376729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7209fb8c38960cb32cb1ef899283cf56ca919b8469bbedff6278e2337391159. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFZ42538724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5b76e09de1dc0ef9d1bbfac05266b2b01828ba2575d804de2bf094eaa59532. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ42538725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b82d2b78cf02e1f98f9dd18416a4f0bd14da0cc2edac587be090ef46c8abd76. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZFZ42538726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac7b00d75671bcfe728ab78caba87bfab3f05b32fb454aeabc88e7e69286c9b. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZFZ42538727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe609a2c86e3ceb82797f80d8d4d6dfc3edf1dd35159a12708a5b7c5d3aab2b34. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZFZ42538728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6b6b538db3b1cbb34ef5d63bedc6f5a1d8cfe60194837468aeb23fd4560dec. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ42538730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7672403e296ddf8ffc7b1cca3d83633010cc72dd64ba1f3aacddea9d4703ab. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFZ42538731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f10731eafe9f2f5589f7d753dd1bb3464c1c6cd7c7cd95790b1cc5e98de7d8. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZFZ42538732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b897c23c65e5f40bbb3c19c74e5e79940db438cdba1dd4b394347dc9bfdd3e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ42538733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb968a8cb5a4ea3d7adc29f5e3e777d6240db3c80cbdfead45dd3532b256b708b. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZFZ42538734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7304e6611c0f1cdfbdc93a7813510c6c6e6cf9ba9648251bc103d889fc20c1e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFZ42538735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8fb2de72b4cbecce89cc9b6eb86e2c3984f3e42353c57ad69a53eba9e18789. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ42538736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7cb3a151cc0161e06d4b5c0be06fbf3faa5dde9175c03bef858f1889731944. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFZ42538737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224ae85d12e84bb1bcdd92bf60957a723a2a2b305f0756c08cd76ed5e46f8d44. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFZ42538738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca2c9a3fa4046cd30562277202c24f06909751393b44c76e0487a8ab88f8443. 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/TCAGT2391920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28d35bfa265cac79fc00c954bb7bc3b2088a70bfd692838bca5278427ccf8d8. 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/ZA56E2419815.