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 0x5f2ebc8b17162241e17afafc1dcb7e330260050f2b50c52e9c0cbee7d210f968. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62862c27-b9ad-4b9d-be59-f4efbbe9cfdf.json and https://artists.proofprofile.net/proofs/artist/62862c27-b9ad-4b9d-be59-f4efbbe9cfdf.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 0x2716b67b2ab4f4f60a32018423abe7f1fec7c2b97fd17182383272814c61d95e. 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/CH6542350018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed87651ce6cc9ad7d0c3a4e7a1fae21bb60e33ccbdb182f244fefd2c48794515. 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/CH6542350019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff4aa1811b834de1025439ec2cb26ed877aa872ab5279a7eb0dd2be6b91bd44. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CH6542350020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00962a163b5617b0d8c5a9ce3345b6a3f3baa57394c7b6f74fc7d66379ec692f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CH6542350021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c1e62469511867ededb66afa3f9395334f35f5bdd6bcbc9ecfb9366e7e4c79. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CH6542350022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6a0411f41a0bab99ef699890d7ad294af5d3efecb3cfac08bb65044269cb0f. 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/CH6542350023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9a14de8a812cffe7d9ddd24bb91f5eb906552416db36139390c34864805c51. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CH6542254440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc352d4f7200bd5ce35b7ba4cd097cad2b2020832cd4fe85a75d5b5c659e66e5c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CH6542254441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc62c201de73065bc3709e5d917cffd969861977bd3c7a366510a1aee1a10cd. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CH6542357160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e410b1c48cc6126a6964da801d195ca066b66112437d1f544d31ecd72ef9d3. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/CH6542133219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec6555b9e471dab1fab64c1e36b739b423d9e789e0e71684b048f08167e925e. 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/CH6542133220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039a2009f49f5ea9df15dd8cc85edb2b223308e441e7900035dfddc9e298e736. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CH6542133221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68bfd8a41197858b755164c841781cfc4f7d8295e634d68c6e4787a83beadff. 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/CH6542133222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93cdca53f0c69a7e3c77309146b1200ae2bed2420c99127f29b07d4b5b01276. 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/CH6541964229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194587d7c9a0c0f55d98879dfaf0ca184f681caea724bfac1fda7c5de307763a. 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/CH6541964230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f58ac47770746259e949a7c85309ffb48241b2a80e37e5305e9a7bc116db91. 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/CH6541964231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf74d5d072d21d3957b601fda7e7d0c52952fdc837ba44fb2915a696ed8b81a. 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/CH6541964232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052305cb3a6475afc3c7d25f925f66ccd2009ee523cb3a36ae0b1e86cee8c50b. 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/CH6541964233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7801aa9527b9bcc3606ebcdc144ab0d764032c1082c05b505fc5bec3c136d9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH6541964234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72897f5fb0cd50afaae1a7c5fa7e337bd1d4667dacf5d510e9c69a94357de644. 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/DEUT22400712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df0570bb87632ea5bf1ebbce544838e128f6ac57a528bd952537276d6c531dc. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DEUT22400713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38698153551523cb61ac601555cc51ed091cd6cda37b6fd8068912fdb2533013. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/DEUT22400714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225ba8fa829f1cee3e56d14c3816d76915ae9da641aac013bf95890c17c93e22. 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/DEUT22400715.