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 0x264ac0bec99291152929a8d793ab7d8a76e2bd2fa9510cb557b0c8e4874217de. 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/c9ca5c80-7a2f-4a1e-ba4c-8637650c4b67.json and https://artists.proofprofile.net/proofs/artist/c9ca5c80-7a2f-4a1e-ba4c-8637650c4b67.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 0xf6e5cdb66e0feaac0d6b0b547702fde44b2ade9c8c74700c7213f63651a87289. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZAPG1778134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60151f00bed1872bf55ba59e380a03490cf1cfe027f0541fe49207468aa36a8. 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/QZAPG1778136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d1d1c7513526377e9aae7f006c1f08279c903a58acb7929162780d646a02b2. 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/QZAPG1778137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0e1a96d395178534bc4270d1afa5ffdd7521bc1f28e492d64765c56eafe1ce. 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/QZAPG1778139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dedcd52ddd2d82b41575d3027eca2e5bc5913302ab31a92eab7f042a8e82f2e. 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/USYBL1200356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8734181bd44abe5cf4cf0d9934e61d7e8b063b299c58e9c294be532c3ea2958. 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/USYBL1200358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77ef452f1ead462365c245aa2b02a79d9de14a78c20c40a74bcbc4f7712b96e. 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/USYBL1200360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd2703bfc10cf5f05b681257a5e75661a97328c34d13011d8c4b638790c3de0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USYBL1200361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef429bc2d1a6afcf00c39fde151ff06de05e4dc17d891c4a35a02572ec49ef6. 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/USYBL1200363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfeedab4ab8f7917aa13ffbac50d6eeff08b734b8fada28ee35be57d41d0e304. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USYBL1300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4879bf643ee9e3e3cfa1e275691a051bbc8b44db816ef1523b784828f5e03e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/GBNG21400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fa5021058522178dd0d4e1de746f5eed0db064d9367c426f3735e139815e32. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZAPG1766654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4587cf8583f825cd44acdb07f2eb67bfb58d4c7e9de8927ee3084ab1fe17208. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZAPG1766656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc96d170494517e24b8cd106c79f0374b93cc85292837e26d8d9f82b70b574b. 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/QZAPG1766658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f030a51088b448a886896065f8fed6df47d4d97c32253fe72f2c87624d7fa87. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZAPG1766665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5dce464abc5f875117327ef089f92931073969db9b5c5eee9cb61cafb7df55. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZAPG1766265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95c6f3c322e9709c1c4caf658cc5197d7e8bd939312c45685a1e6dcd9559caa. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GBHLW2103081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78577aced1b47b01c6c3d696b4164ec3a2f4cf4e0dc3d8252867be83a54bca3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZFZ62307244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ece523497ec41f9f4c3ec5d2c710f038bb4386f24fc2e932c215b7cc18bad0. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZFZ62307247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e24ed062232c83de40ade35333f7aec312dcc292e34a559f141879768b1f78. 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/QZFZ62307248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16536f2bebb53dc0a8c9529f61c620dfee4da443098ad42d448118b69eaee079. 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/US25X1083556.