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 0x154d749fc2690198f68260732a3aa450761b32f3aaf04e43c56e9a258b9a4f67. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56d3f3f7-1648-4613-b58d-ef30ff929ac4.json and https://artists.proofprofile.net/proofs/artist/56d3f3f7-1648-4613-b58d-ef30ff929ac4.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 0xb47cf54bafb8c9f5d2e428d3a28b1df464b7e54b509efff6de8006b9aa244495. 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/NOFYD1024010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138f93479e33303f9d3a48311932a7b238c388a1f0cd1a47ba7dca3e0c466600. 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/NOFYD1010010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ed58e419b9117669e52b4ff10df2fc61844998b9eeba84c22f85de7bbf704c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOFYD1010020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03561f1a86fd73c04dda23390f5343cbe363ffcbae4a8ae6afdaf5dbaa699df0. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NOFYD1010030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33d6a3886810472f37865b1d2118004e90a3a42372d7b2ede5346126294ad27. 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/NOFYD1010040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad99e5a6be061f142a31a3315f48c1f97e05701f0cf52fbc48cdc543425342d. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NOFYD1010050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2940a880d181bc045509567d7322b85d7cf88d12cb51cf403627de177bc874ec. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/NOFYD1010060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2408d35b84a507c99393d2ddd61919f50cef96a4082f8f0e3513b3b44ce390. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/NOFYD1010090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3045befdf02214e7ccaec4540916d2c25ba88c4ad1e514c74d3aa73eea7adf7b. 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/NOFYD1010120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae91f41610affe002bc141961a42a713bffefa5dc4a2e9dc762c965a716b98b. 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/NOFYD1010130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe442e71ef1826cb21f3a03d2f9f990f4837dc27443c4e3d7d215a17c41406c62. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/NOFYD1010140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef53dea65a41cca6134cebc7a33c54166645078bf8504439c74c343f0cac0ebe. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/NO2OP1102040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38d31e2c22d46d2d7c854066fd7101588b4fc64311578baae2329e647684a11. 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/NO2OP1102110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293dbc9301d0ee3bde5a36767d2641a1ad05bce4e023cc9c97745f4e5ad5d1cf. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NOFYD1003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7b45bce3633a52fcc44e5f96cca3a2bd04ed99a970bc95406b2ec7300dd400. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NOFYD1003030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e1dcf41331eef6c497296801f3711f3095ed8a508d996ea6d1e848eedf7bc4. 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/NOFYD1003050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ae875782109c546bf7b6845ac67a64b6f3d87a265c150dd0904643216a3710. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NOFYD1003060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac6315c8de3a80f022763d3b6a26e391d83647b6ea5ffd74b492131c28e3c15. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOFYD1003080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68f95d12f3567473bb6763144d639ea1571ef768ff80191a151ca01ecc7d2f3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NOFYD1003100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1320a1fff67bce4cb8efd708335b62b65b0f9838639cd5abf672479d80b354. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NOFYD1009030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1e8afeaa7fd92f44b4908317a1d2a8937e4261ba2b4c7f1f50cb07d29caee4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOFYD1009040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76996dbba3c109e3b661a1f51f9bfe9338deddfbd590ad4212ec178879b58619. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NOFYD1009070.