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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 0xcfc6c8f66ccde9baf16f255cd51ebba435c830e436022094dbf4f66a8a0d0ff8. 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/0ce2f017-25dc-424e-8764-82a204aa58d0.json and https://artists.proofprofile.net/proofs/artist/0ce2f017-25dc-424e-8764-82a204aa58d0.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 0xe37cbbf9242dd97282628b2db65d39edbfa84da03da733fcf6b90fb3ba43343a. 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/QMMZN1300339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec6fff285501f77e5aefce41e83b43b83c5017d86f5aa8afa35d563cce28b4a. 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/QMMZN1300340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa7dc9bbfef33e5b48d4fb4e90da316cbdaf6e88ec826706511367dd57548cd. 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/QMMZN1300341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68743b546f968d48d41d723d9979b41a961fa5e9354161240d02e2319641894. 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/QMMZN1300342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6be31fdd5749c967da0203972559e9741cc5b01b24e4b5f6701aa6e9442309. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMMZN1300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b92d81d3eeaabfb1bc3b779643424310269ec365869cea91a3fbf0d11059539. 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/QMMZN1300344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb37fe4704bcdcec67f1a706df6b3e8e3d62ba04dcbfafc1d9ef1fc82a2966f4. 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/QMMZN1300345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca36ea13bea706580eaa9039ac2a89f702e724c82f580b7719ebc8e8ed2484d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMMZN1300346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e06cea555871f9eb5491ef76e9f9112ac77b9a348fbb98b1f9cffa147b45012. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QMMZN1300347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b9f2992a8f6e73c012251607a392a17620ed9a7eae88c7d6275e4b5c1229a3. 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/QMMZN1300348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983d05ce192b0013e621b9e05a20ccf304e6fc3019c7601a61bb8929eac372d6. 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/US8YA1110179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a7df8e25639ff82344ae3901d0c402f5d541fa3ac37067183e36cd715e52b2. 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/US8YA1110180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979931256c3d73d4e7e6724f1f524e9f8d9253e3cd29c26d4783685e7aba670c. 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/US8YA1110181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299e7fbcd3868bbe151f09ea410fba399cd568d72560562a1f0ba2a51b301c2e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US8YA1110182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076107062daaafb93ae1cb996fd08383aa422557cd037257d7db7e2fdc0e44bf. 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/US8YA1110183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d78de9d6619a2744e766d02686e072f48d72e716f4469d50c777d38523f7c11. 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/US8YA1110184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cbe4731524900ca41eb13028576ec0169e4c69c9340c1bbc415e00ba22b9c1. 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/US8YA1110185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde939aeb7fa76fae2485626b73ac3ed051ab3bcc15582ec68ed82ac15ae9cc80. 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/US8YA1110186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcced1b9d8bd495f6d52327a3fdceb53d1814c60778b76b7bea6c2f3ee00d333c. 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/US8YA1110187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f3a38f5b66e0e46d70ae123797e4c5748b5d3672c6aae3a87bc9878caa8f96. 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/US8YA1110188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcaf1a5ee6416e06854892146b8fbd1b2561e5d75ba15cb16dfe99fbe6ecc02. 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/USSUB1193901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb270c33b414c992604033a7bd01dc12d3890ae3e557acc581a7b922a088658ff. 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/USSUB1193902.
CT5 Sampler: Five Years of Captured Tracks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6df525e0e628acef12c97b089a28a80e268d86a785bddf269a9dfcf48a80b99. 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/QMMZN1300122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885013c14e172277c025664cd4623bc83a89135bee17eb30729453e08d039e57. 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/QMMZN1300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2aa06281738ecbd9b8157fde768b2fd0d91e961bb5ba998a4556082fb6e8d27. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US8YA1200154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b056356e049d6565279faabe2c56f83e3d2f1a8e046819fda3e888bbd38a8e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMMZN1200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34f47904cbb1763894b1181ce780f55141bb59130f81e0b27e02d61253acf91. 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/QMMZN1300330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926df1d01a2089d474fa4db423f6b755c486b8f50aebc04edee33cd4df138115. 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/QMMZN1300193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0a69086ad90e85a56f4423d5083b8e5dfc8012e8bc9ce53dccee7667d15dac. 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/USHM21424042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1dc486bf8951903a1e16bae21223456af6a6ad1f5d28e6f585a42891d945bd. 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/USHM21424047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43676c641c6aac0089fa0a33fcc808b1af6b5301113a2a17113f4bf124c3358. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USHM21424050.