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 0xe1680f4680b4ff41e5659dc3906a47deb82decc49037372ed0bc2a7faf1355d9. 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/db5da1cf-6688-4791-9684-549b5a0cfeed.json and https://artists.proofprofile.net/proofs/artist/db5da1cf-6688-4791-9684-549b5a0cfeed.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 0x3bf9d49440c363312872baa6aa3a638fae144d1a869d484e4046158eca15d9fc. 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/NZPB12403470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ef7e8cd3a74ed8e457554c70a403c52f558239147b82c68941426697c9942d. 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/QZFZ72301219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb343b016736d6ce0552f1fdff494de8d940ee324f094ce8fd96e2e4140e91f01. 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/QZFZ72301220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747498d2e4ca4c62f105c5464c26b3b35fdf3075ff1f0e636bc0fe76ef1b3ef3. 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/QZFZ72301221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16410f7361341a80bdf67af802d187f67245f1b3cfa53ab541e3c509c7a263de. 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/QZFZ72301222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c7de498234aa784a6ae1558f86b1d5cc3d1c6e12a58663c7159656a1d77756. 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/QZFZ62315835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c7de498234aa784a6ae1558f86b1d5cc3d1c6e12a58663c7159656a1d77756. 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/QZFZ62315835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189f42bfdb298285eccfb7312e30bed8a452e1d5c4680b4d8f5278987b8d8431. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZFZ42481995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c767185edefb2ba594fd505e13f91b673e1cd502c57779ca26fe4541053650b. 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/QZFZ42481997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cf125f7d37917f324c947e9a279d3d08fce236517836c73904996977e8f35e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFZ42481998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c4fab1e29f29b3e49b8cb3a5367d6cfcd08b5cdd93a8856879f80c4c281d8c. 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/QZFZ42481999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fb0ab47ab3fe88460de007ac5b549028e2ace0a6a05d30862c87613bc9b836. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZFZ42482000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8588d856d7e4d49775552808dd087e7c5d2c374219935eea7fda6ba6e698b7b9. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTAW2336632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2251e6c48e669ffadab6c85562be7be274403bf387bf26a5ee2af70c20cef2. 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/QZFZ42482001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c1390cc9632c07d3c5882b3091cec7a1c4c0a04d5c21346d130574f032c029. 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/QZFZ42482002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51520d90429b3cf5a3a7490b9e92eb2b358a8d8c61ba374e20302c44b099270. 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/QZHN52338511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51520d90429b3cf5a3a7490b9e92eb2b358a8d8c61ba374e20302c44b099270. 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/QZHN52338511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f44350fb742be948a78f8b80f7f9d35e4a1c1fd7daf85f67261e722fba876e4. 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/QZFZ22428886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c760336c7edb1849900a62991df665622f5f7b6c9715199d34c009441f8a2fa. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZHNA2367198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ade6f876ace1248ec9a656589afb1fc4fe4361fa7261041506ef10de84a3b6. 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/QZFZ42388574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea98cc522007a596f91e6cc21044e9349c66d3ddaf6a5707836b3911324fc199. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZFZ32331144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9131dc8ed87c3f2ec45e9c3888dd9fd32fe1f7a402f108497be03bc1412d6755. 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/QZTAS2299373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c20d16d3d9974fc7ed88082eccacd33719b958787c74139cc7b790ea81500b4. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWR2284786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926acac9c6030c5c6af492399dcc3ccf0fc93b29217c19b20ceb05be5986c76a. 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/QZHNB2235967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae4b205c442dc934198f6442147bd4b3f3364a0de287edd01c0cd250c1912c1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZNWT2067381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf91ccf8e2783106decc4ccc9f2e440eb0ba613702105e989af7370a01ba8afe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZDA62056017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fac45cfe79aee69d16c66d1b6ed393c2a87596316201cd167bf34142a850684. 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/QZDA42026342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79db9cf9a1512cfbc69b721fe8a88d50bc7faa86cedf8578ef98d4f45fad8d20. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFZ72079886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da64fdfe012354f8e3998900597091e529ce2686497bde35d5118e136809dc4. 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/QZNWR2326912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3a7c47fcbf06f8c5a18b8aa47072dd49c1441fad89f6f66f57072bf1a90e97. 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/QZK6P2306490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b634a9c58377fe9148287ad1e58e507540b0ce0189f1ba5d56eff4266863b0. 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/QZTBC2460295.