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 0xee991ad37d1eed4ecfcfb91ea06cf94ddcc2d44209cabc6ba50c97b5a31c76d7. 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/51d6ce10-54a8-4339-ad4a-2f68dca6af39.json and https://artists.proofprofile.net/proofs/artist/51d6ce10-54a8-4339-ad4a-2f68dca6af39.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 0x854dd3a9fc0c69c2efe654dad76bb8d4f4237456c5587c75f8851c4d901824bf. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZK6F2240016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fdafb17db4b16c1ffabc48ebfc75f5ff6c052da551607177fc91c9e7ed6b56. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZNWS2230202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6317a64e19ded89d595f8653ba94dedf34913095af5776a8dfe175accaa611cd. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZWDW2358900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f61c6a8ac26406bea1c1aa063694508df4915527bacb1dc7a5a976a3bf31483. 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/QZWDW2358897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905e69c0ffe8f0c31e5f8dcac5c29aea9a4db4a0a5f8897b4a78d259c803a5b4. 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/QZWDW2358899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80f9301a16834e8a00332d106a07a0257ee14e442f21e31d01d565f32601352. 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/QZYFZ2349458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3466b723f8f30fccb96cb0974f1baba0c71cbd2ba376cf47f5e197a0cfbf6826. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZHNC2414160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f8e01aa388cf6ad5be799ae544e21380b2378ef8423b9ec0e8f80725b9267b. 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/QZK6P2419192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b9fcc15e6fdd91995974b340fec4741b8ad893a69deaad2d00b2997b4d2ccf. 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/QZYFZ2442364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5621d558d4017224f387894fbe20556cc67d0c2d03adddf7fbb1304cea8b1b19. 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/QZYFZ2414462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe149c58f1642ff180eaeec9285296cc1491f1a858d6e58f170c3fc5d5c60fbfb. 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/QZYFZ2442365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf6b23db69e3a13677d53f34b0629f5f4ea87972fdc55a37c50a059f06597d1. 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/QZYFZ2442366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be9f7444c8f62a553ffe157adb2d5434bcd9bd81a7804fb197d87aa89a0d3dc. 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/QZYFZ2442367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9bdeea09be5ac5f8e58a9042dbcaafd19e0984c6cad62d9f84aaddd4fbde7b. 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/QZYFZ2442368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c9c2375e12d17f974ea4564d445916bf0b3047602881df50e0335e53a88bd7. 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/QZK6L2429814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fa386f5ab333aa7b04cff034541acbb175817c10f0ee34236f8abbab01dba0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZYFZ2462822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85c1d17ce78a1d3d8d42391783e4626151fdf423c9735a0aae2c479e90e5c81. 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/QZWDW2442644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc444c9f3f02438ce489018e8213297e95ac7b2c696f50244264a442aeb05c. 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/QZWDW2442645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa61305d4128a88921198a7cae83dd726c961800ddc8acd22b441744cd82b02. 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/QZWDW2442646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a8fe229d65be665adcfc3eb0a0ee5fbfc1dabf2fd605c4d02c9e35be5f02a4. 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/QZWDW2442647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e956154c98c2c1b321bc731bedfea2986a3f49e8d4fcba7933880eb7ea9a3d. 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/QZZ792422799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b47bb3276fa014326e61aae10ed433baf87c9034d16d099cb0c98e326bb4b6. 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/QZN882524389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477205ece283e2f31090c0bc4e5eda7f103dc3336d203e7014eaa5fcee494c4d. 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/QZWDW2404869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcea5ab10e81901dbaa079264bc8a73e0b1dd148b31fd224f5a0bead005fc58. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZMEN2146614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3542a4971bd20431d1b8139361816da990a85c5d96fc8ce7c0489c6dbf9244f4. 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/QZYFZ2428004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40aa989845ca00d1d4fd1464a2817ae556c9a0a08b08721af4954e9c88f3013. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZN882401306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e46d99cab9d3de7e6ebc554fa35db31611a868122cf7093a95870e38c551a4. 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/QZYFZ2303140.