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 0x01894fda5e998ea2576f7b3d15488436293d0e4ea682e83e7f67cbd52e64c8cc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65c042a4-d1ed-4d73-abca-92eaac75c1d4.json and https://artists.proofprofile.net/proofs/artist/65c042a4-d1ed-4d73-abca-92eaac75c1d4.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 0x8f9aca4c1a6a755455b4fa65b567d206c0c42e25e638cc2ff1cabb050eb8e0b3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6Q2046223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5d22520d0f275343458122e3de6c945477379fd4c06c83bcde52654c9d4ffd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6M2165557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe678027362f9372617ff1fa6b24e437c785cca5715c880be9a887144a69a7652. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZK6M2165559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84857eb12c9f0c2945a2168990d4df6649eb79069b477ceca0651e19de96f16. 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/QZK6M2165560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc48660ac0259d7c4ea265780e53db3a76f45398c86c0ab7c51bcfe692e77de. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZK6M2165561.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf66e6b873f9a94026ce4f24011e50a3ce884a1e41c02acf1673c3a1b4008c1a. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QMAAK2514817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855da674c371add8d0d9346b10c3b8443d16e3c008b7caadb771482022f45f92. 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/QMAAK2514818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba52659bc75e4c3dc1ffe41f19ffc813bda29b08a9868c8c01e3f423c1293a4. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QMAAK2514819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4507dca801c7edbef6b7009a1a9f218a0b98052f5e06f7115ca38e447f4914. 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/QMAAK2514820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb9ce628fa1787e046c116562f7b1a883448335566ef565eaf9c16456e64a7f. 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/QMAAK2514821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9494b2707b568d90035f05111cd18569a0793e0e29a37d6f0b497b702966ba7a. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QMAAK2514822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb32aa6cba7af77ed7b62b48e9de03e56ca0c98080095c01d821e6e1e1f12dd1. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QMAAK2514823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d2588c2f0d9ff32f5361a92ea8f242e28503f936bb77f8eefa92d73b2ed54f. 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/QMAAK2514824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a03df9b60d1c6eb3b53a7ca7476bfc87ad942bfac1078a6327cacc4aa04770e. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QMAAK2514825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51caf2e156bd5a82436b9ff2f23359883db0f3c0715944b972aec9c6fbd3141. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QMAAK2514826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b4361a76d1959155276fda3ecad5a0e1efedf4b18778a37014af560ef1a977. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QMAAK2514827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85946f86f330ee14b5a3b3bafc4579b97a933b633a70d7e4d55459125bdd9ca3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMAAK2514828.