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 0xbf51c23d8b843b6ad6ade266dac65e47752768ad98506ec82f29b3898d4697b6. 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/27a5a474-691f-4230-ac78-4da1d5d546c2.json and https://artists.proofprofile.net/proofs/artist/27a5a474-691f-4230-ac78-4da1d5d546c2.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 0x28ef6ee3a2284e04d3125edf5d1a1315fa0e0a85f3db1a7177bf28a516b81dd1. 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/QZN882229771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066744784f66a2a28d05ff033aebd92b03acef6e4278363dae5572f2797aa51a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZN882229772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a5253d4aad2c2cbb8c3a0a4441784238ddbea5e797f147e54a37f56671ee6f. 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/QZN882229773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bec6b5b3c7c2786ea4512994700ec90c2ade3ab4135288145a62d63e6668b3. 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/QZN882229774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63ea12e09298f1318cfb23546b4cc936358bc0b10ba1f0695ecd6d842f21b04. 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/QZN882229775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fcb9d9b9ff4b7d68b95764680fcc690f2f757ea5e672aeffb2efb2dfe0b695. 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/QZN882229776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8bfb99d516f1a638694154d5f02c73bd0dfbd8423024edd79db495e550dfad. 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/QZN882229777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441da6e99c98f4eb0ffe261241afbe20e0afe44e605ee58acb46167485ba3260. 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/QZN882229778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc1fcd1ac8ed4fac48df976b4949bb2e758afe5386fd9c043f0121141b9484b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWDW2331094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff25c236e2e1abc413c802d9294c4dc08f8c0ef59a472291821b26d180155308. 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/QZWDW2374586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8929dc7124bda412de84fc711f1705b1affb1b44c36c4f2120539a180c2bdd02. 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/QZWDW2385626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8fd6e4a44740a28d541ca0010852dc50abeeddfee9c45c6d8adbfd9792c16d. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZES92562532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafac60245456cf430d018d01abba2e92b0ec10532f9cd71444050d1a626deed2. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/CZA232500715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda79366ed2d482e1af1f85948487585d32b177654f3a91373293fa3952ffea6. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/SKA012300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a5df48bc962dd66cc93402ce33dcb21883961208c7533729ae6a8aec75b789. 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/QZN882202320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3657ec34c60a696a40f4f6cbb8198ac49fc03c9a0c606b98bcdb2fec2d87bd6. 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/QZN882241564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef4a1f158e28589443b6e3f6a5c3481f2d3a175285ffd266cf3819e196d9117. 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/QZN882405157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29a7f4b219f1099d8a4dccdb94b6ef154d7a9627abc1776b1a0aabbaf068d10. 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/QZN882414166.