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 0x8e3aed98279c18f4ebcf28f68d53f4c60c87159bcdf40673d533cdfe59d2faa5. 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/f20c29bb-8990-45a0-9169-667838f6ffe2.json and https://artists.proofprofile.net/proofs/artist/f20c29bb-8990-45a0-9169-667838f6ffe2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xb767d3176e379a49dce0c48a1d479b74ce02a355909c8baf0c81e9119e2f4081. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN92209441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ccd454d9cff76bfb13a3a0d0763de48f23c4b258bda4795d7b191c65bf66be. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZHN92209442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a2e1e9d4246c183678df407667433a096e95dd5cc17cdff04dc4b4224434c0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN92209443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915a8f33f34985f34e7680660f38a7e756b6b66d148d04d2e046df9a1eaf30a6. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZHN92209444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c4a02fa94ffc55f469b9c60c19456f5343fd705a4b7d261b9c7a5ba0160a0b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZMEN2453437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54ad2d36d67dab4cfdebe1d23747de7fc082bc9d5470d13852b49dda0ff2700. 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/QZMEN2453441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5c57cb0c91e510999a5b2204fc1684e2bcc3b3dc54f295fd479d483fd42f06. 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/QZWFF2488892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cb12da8493ccfc91d07f77e4588d660d11b07b97c744440decb92dbb4c063b. 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/QZZ7P2453210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22fb1d70939bb0bddcb9a872835510b7564d9d057d00284dece36b2388fbc15. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZZ7P2453218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd295f0cfb64ba38fbad999120d75d8ca59fab398cdc0145aac3d2570241872a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZZ7P2453222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca9dd17508994849cfe915ccbca3b80d7782ffe934c948544a0ca7e7edb4f03. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZZ7P2453224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20c68f60cfc30eee487a98050bdc54fe24ab31f2b7abc5060f31e3409d9a0aa. 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/QZZ7P2453225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d142eb83250f8e0c0a3f654021e86ae8f8c2643d21594e8c3957b0bef7e453. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZZ7P2453226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbeba927eb3e9c680c7a0dd0e790214b080dc276c7293973dbf3431335013efa. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7P2448153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7065120797bc53da5c4362a7ed065b85c7790f9c6a63b49bbc5ed43cdfd811e0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYZ2559494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cca9bb1b11f628ae532e18d1b61958d9bde3dc4bc6ffce289bd88dd1c9ec8c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZFYZ2559496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bdcae9188a26f95ffe531f01c93b07056f257f6c9083a0b31f35f8d4d139fb. 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/QZFYZ2559497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453d0cc33be6a1713016c5c06cad736b62389693a2e3590677bdd4f798a200ce. 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/QZFYZ2559498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc86f500a32fff25db6f006673bff532fd83c4d6a0f0e32a1c4c5b0fa78ec43. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZFYZ2559499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1a30d7782674442cd8eef3f295316b55c843aa18d029a42c0f1988c5881b2b. 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/QZFYZ2559501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246959eb8725202399e354c754edc91e9e904cafc80e66ccf80cb2e5c9369662. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZFYZ2559502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedff4ef36a3dffb77698d7f4f3a78d1883a1f45419c672b86b1d38c1431ea11c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZFYZ2559503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07bcf2e6f7f4762c3a6d0517fe7ebb994c86c0ae351d5a43bd9b5d14251a73c. 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/QZFYZ2559504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0961d61a8dda7a2f75750eefbafc6f77c79900f659e1eacc70cbcded216fee. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFYZ2559505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd612f1fd8ec72f7029ab173d823990ac0b0ac51dfe1af906e8d933f8649a59. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZFYZ2559506.