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 0x3a774b63f76f44199f49771f8da1c4b83d281541ff913ac284cc77c5cc95d27f. 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/3730c247-4100-48ee-bce3-6d8d1cfc4b71.json and https://artists.proofprofile.net/proofs/artist/3730c247-4100-48ee-bce3-6d8d1cfc4b71.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 0xa87adf2f49fcacfc5a748183f2e5685988d3cf2f66c5bea4d9c989549f123de3. 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/USNRS1836598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a23c7abe1fdd2b8bc57a366a68e5eb8a38171cb4984dc46d4dc67d334cebc4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBPQS1900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f97c3e2c39c432da7945a29281051b602a4b0fc1aadc5a1c2d4bcfb85166a52. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBPQS1900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d09dcd371dc48c8c0664ef2cf3d0e133ebd00d31ea36cda30c23d7ee6931467. 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/GB4PV1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2d9b38d9494643c01d7d503fd12a77cc477e73e9a8469edcb24a0992e9acda. 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/GB4PV1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63311cb55790df968c7418a6f2f0fdeef2a33fee341808678203efd92f24e29. 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/DEY472378907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3eab4ee8fd45613feb739717985b7f225c75102d11c212efd0a8764e3771809. 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/AUMNW1800232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6386468e0aa1bfabc2e147990d2473c33e20e75245a25519140d2c48484f882. 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/DEH742153436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe832df7624c6d7fed4e7857dfc178b4f3642b0cd51431aec5f886f38bf2ebb2f. 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/QZ5FN2055755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b92b4228e487e90eb13233d5eee8bd6f9900caed6468397ed653a4918725d5. 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/DEY472084183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc1983f84ef8c05bb963a37f1a726fe2024e59be5c992059a8b76e38205d750. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBSXS1800129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8cbc8cf3b36cf2e23dc650496746fc73be83619b6bb0c70b2896bb08af3a910. 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/FR10S1854554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2bbfdeebc410ccc1ef8aab6343a0ea1a500eeecc3d5837b1dd4ca71947ce53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEQ121750022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24418d8d2a249e2837691c30403429c213cb7617c10a024e99b58896f6144ada. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEQ121750023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77485dec0d4b77b337b933cbf101cff6ad2c6b5c5a61bd5b1dcbe5280cd04dc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEQ121750024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec41fad1b24faac8218f6b02d532845756fd89f3ace5c0f81869486601d94ae. 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/DEQ121750025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb7054962719853509b88d24b74379e7b44155e92f947fd6b3f63dc2515a9db. 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/DEEE71700870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9042144682407712e18ff0c20f46ecca9348c05a24a590166503bb22641bcce2. 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/CH3131620093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6454c0482d9c5735e22d00793c6311b15190cf7fae9c94284fff21052bbf2177. 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/DEUE41700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee277591d705a0a9a68038d7f1b89e7f3f82ea0c31289e71f9c3caeebb41efbb. 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/DEUE41700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f5d013358fc9ec9a3cb602d9eaef41a3ee16f5db2c2bb3e052aa82b833a6c5. 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/DEQ121745957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcbc6ef1b2ae4bdacd77cee1f132b6ae8fca6e2808605c11ffbd1771f3be05a. 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/DEQ121641964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a2744ee75df0d92b292b3a1557cfca76bfdf755ef90f7e44ab48574a640a6d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEQ121641965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbc3ef91fbfd9726facabe43bf333e9705cfeac0dcb1361cec6493bb9e8c245. 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/DEQ121641966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c79edfeb63027693287397b5ea8390fab427bdce368de045fedcd0479a02fd. 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/DEY471612603.