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 0x327380321971fe61090cee7e593e4a59acf0f4f2560fa97f39ac360e5132928b. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4ca94e0-1a48-4d67-8549-94bf0c715738.json and https://artists.proofprofile.net/proofs/artist/a4ca94e0-1a48-4d67-8549-94bf0c715738.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 0x0873ad473df1ebd3f08d001de4f5643d0a32488d9b81a1093ef80cffa3f4a4c8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USHM21253089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b85b27d028414a2f8c1881b7ea97328aaf0375638cf54ec87068a8610339bd. 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/USHM21253090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f94f9f15fb086cc5349e3a26cadb0deabd3d90aafa800801e5110e57fd2f46. 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/USHM21253091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0e2a2d59ccf85c6375694cc5c20f16f288add6fc5219318d060d5fa70df97f. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/USHM21253094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd51ac61f134d773e70f26f2e934c8d8872174e1f44c6eea05452004048fa8d0. 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/USHM21253095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb4d6cdda8c5e66c53292fbb7f72ef3405aadba369142cbf89dcada7cda3d29. 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/USHM21253096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfeee5b51aa6a099367018110137eb7b51e66dafc0b316fb4e676f105eafa00. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USHM21253098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3c6e453f37f83a91878c225bb96c139ce1a4e25e55a79c863257102b56a463. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHM21253100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dae8779e4bb49ae08c3f9fd54f0e9c960fed362f4bbfd605a7c84048b7bf91f. 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/USHM21238246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba42dea8d5588410853ab316261a4cedd2d0ce1de4cb8eedd66ff9cc0ac5f34. 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/USHM21238247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44580033452c3d57fe5f00ed11a351d3282dc878557088e569bf2a63bea6970a. 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/USHM21238248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc828ac9196342de4a52bd50e56d2e0ee3651be950795b50b81616eaab5fd26d. 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/USHM21238249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d6af80c56c3835ee8636d20f193995ca2b9a312eeaa8ee70c808fb8b790e99. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USHM21238250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a366b311cbd454ae4b2ab30ee6428e785c75f56ef805109f6175f31eecffa98. 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/USHM21238251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187e1798b0538b405aacfe3c4c498f7c2fa492ac0872404040e7ba175b0888e0. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USHM21238252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe418718a09b7553659aef85b7a48afdf7fbfe811f9b8ef64bb8637e4ac28a9a1. 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/USHM21238253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02389bb82adc2097297d2c5a551f37a8c8eecd05ef3a92d9bd2f219cd1bd9ff8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USHM21238254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc322f55952283b236d9030cca7641a702a6c6765daea2203853bbf8495ae6609. 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/USHM21238255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbb12b58f41e75551400460009150ecb1d3cdbee7dd4d0e4e442f554065bab1. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USHM21238256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6afafe8f05e64edd1e2e6eb68fe88e381000a593d18113c5f2e3c7212de7cb. 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/USHM20977426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f52105565e0be626914c73447b81015dbe42953d14146319d2d1be19d62ad4. 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/USHM20977427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbfb14b86104e4e4b211a9eb4be1395977c82c8d8db6c8b55b6efa7a3d977e3. 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/USHM20977428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938940fa099100c6e50d23c772479dfed71bfc6730916c65c5f12d7f8d833e2f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USHM20977429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0678d0b790cf15c25fb3580e40b8c49cd3d83cb014385cbb8c6193fb4f42e10. 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/USHM20977430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6bbeda6bc27869db3ee293c32a3ba898e0eae43d3eaaf0746e16a052572b53. 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/USHM20977431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcf4211547fcb7a448b5c97c2fd9405115070fb89663d23b38b7b1e32328eb3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USHM20977432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e129da0863ed475502a6a387abc42ec9a673eb5005764ba2848b841c97aba2. 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/USHM20977433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f03d309796bf28300dd194cb54d530779a62f2fb002683f039e2891c160ba7b. 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/USHM20977434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6981cd4946cf84ddf3edde1ed587f253a559e7702c5dac8061a3e8f8a41ea6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM20977435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d45112b62332eb0ad8ef7ccb7bb8e1c1dbe79a242f4182e16b97cc2f5c104e1. 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/USHM20977436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ca4b532f4e56f80a4ab085ce11f5effd689b9d0b59c484a6d76891fc559924. 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/USHM20977437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d97dd27ab994348a5c00cae1ef1ebdfcfcc66f28ea725ed6aa66cfbc787eb27. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USHM21768574.