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 0xaded4229f9e641645dfe8f3e97857b83c934b2dc4d2137676eb979414edbdbe5. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48574cd7-4bf9-4696-9377-5d6a808a4cd6.json and https://artists.proofprofile.net/proofs/artist/48574cd7-4bf9-4696-9377-5d6a808a4cd6.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 0xeb646a0944f4cd265466cd40dc1989254d428c85bd60e92cabcb5ab566457ace. 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/TR0330604308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c936c1b52869ec6a45ad920cc83300ad7a9de9f5f6c5c9c3faaeff4a7002e89. 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/TR0330604760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3d51e91323a1306a162e7256048216eeb305fad3ec7fd4e050ae4fea70b2ca. 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/TR0330706187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b2e7cb1bfa9a56463d5de6fa0a0aa83e6e088593d419b69dd92ebc551ab1d0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TR0330907047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2310e1ca5a20ca4147ba39e1a7501e5896013ed64090266939f5efe257aefbf2. 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/TR0331007507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c82005874f83042925e04f8223c1012a80544d6abb7264b34b1296172a9bd72. 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/TR0331409999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc5af0a5fdda37e029e94af971c80ba9429bc41636f7e4814ccf01ad08c6183. 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/TR0330640322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c5f8fdb65be0fee5e64da00936efffa0bea0f34376b3146604882bcaf535ae. 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/TR0332313075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05105724866c9412eeabf6859bd4414b2bfb2d20e15d98061b0fd0b98738a56. 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/TR0332313076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda1a1be555adbae952ca84e5e44924256d10420dacbb14c8128511ec08c64c0. 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/TR0332212994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4495d79ab4efcb4c7ee3f8ae3d1f358388dff3b2e0489d822c83b03be91d38ee. 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/TR1231001501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ef4f58e4600d73f4dcb7116f3d388cc6da693a66adff34d7e7d1c4447f0d7b. 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/TR1231001504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92742857061b1b797fd25199f41dbd3a31bd28f2001b302615fc8795d6803e7. 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/TR0330603077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa232c25045c994efaac7057b924c3f649b588dbbb96fcfeabbd2df1ced52f84d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TR0330600929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba33f9fc13928b2795a259a6671091bfbb8ffce7da5627411abf6232041c3567. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TR0330600928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea201f7915ce141d43ddb921b1f2887e5898f15363b136add552388edae3ff2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TR0330600926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acbb53770dd8abba9f837ff6a08fe369d41ed0a8c6974d559e18ac2dcec2ef8. 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/TR0330600925.