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 0x928e9b2d839b57c75370f8297c66795fc6850396a8f66a1c955037f9b3b6a167. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c174806-3e54-42e1-bdc5-197c51a2f519.json and https://artists.proofprofile.net/proofs/artist/3c174806-3e54-42e1-bdc5-197c51a2f519.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 0x3ecf610869f844596db4775df66de01d65a3cea774f2e8b2d9510954789ff10f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMHM2336623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b808d85c0e86089b80702f3293632d27a373c2c22785ad76a48df099d03948e. 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/QZS642331230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ba41ebea1b429e04f0ed28a94a1298227edb7474f65ec8ce0c59fa7c52dade. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS642394930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c391c527623928660402b0e5471e93c69ac936f6397ba0a568758102a8411ee. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZMHL2351192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f02512718b08e583a39339152a515dc867bdd217f1ef79174c41d47ba03adf1. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZMHP2315518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4743b9633d2aac86de88331442c82fe167d67afd0a476d13c5dc5ad0d9b205b5. 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/QZMHL2339839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f85309d66647f71e14f1165dd1970324243e9764c39e8159b0c97f0db787aeb. 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/QZMHL2396390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd022537196a5cc15bceb132c3b6ff410204b5caa8b8d8e1fa2992160da28ed39. 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/QM42K2301426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d30c6c50cef5cf2c7ed267aa02d0018f342aa245f72c7c194a97d9ccbe17d9. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZS632228818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9a76a145eb9048f26ae69f4aa8ff5f49a2abcc5d1690bde296e344641aecd9. 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/QZS652320245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb33df3924f49ad2bb1a09b48f22a292f11a6ab974e53e31ef9ba5843c2a757a. 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/QZMHL2208563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006ea79365895e8b7f6f13f8f6ce2f889755968aa9d2f37ed85c1a6387270ae0. 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/QZMHL2395308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61a4ad7f49bacf2b3ba66bbee67ae074ca3e25fb34e9b7a0d2dbfe811fbbe01. 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/QZS632299587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdacc096046c847da2a2ffafe2d9c1fa82dfaf14050115a615d84ef5a6612c7. 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/QZS642299173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a6d4395a7b98513c9bc6636f3f1c7c943fa65d0adbb542f8e76d582092fb74. 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/QZS642169067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fba11d8be93f7af232efe5054c31ae5a4493248c5dee1894efa91cd936fa4ef. 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/QZTAS2189684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe768b9d7943ca44cbab82efcd9d8f3e03aa8dc29c03857ca460b235df58a0fb6. 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/SE6I32170919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609dce854ff8cd845a07c33e41a5021bf0c8733da62ff4823eee7abc47d5032b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZS652196173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50e07cf6804e844f55d2ca4aff546613d51a9ef6e89dc5f3e8b0fea3f065c38. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZKDK2132055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ebc397238fe659d7c0da17aaf39ee13710eed948d1fbab2dc7cabf28fdbb4e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZKDK2159519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd7365f42e02746336f46fc56a07e75cf1bc47357b74e8968f9d27616e25edc. 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/QZMHL2039346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd538b62d150d895bffc0ee7e99b6eb1972519fbd46e5883f97eaf0b3af71dfa9. 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/QZKDK2099803.