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 0x8cf0ef1991457a8318400df5311931526c6420ff503d5ac047f4779f539fd327. 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/84c271cb-dc67-4016-81f4-f95c6fdd8bdf.json and https://artists.proofprofile.net/proofs/artist/84c271cb-dc67-4016-81f4-f95c6fdd8bdf.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 0xc64f2ab8efaba734aad9c7e192d5d87baa12d9b4898f11701bf5631828168d53. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZS652144701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d10ef35446cfb2cb685b6e58f697b2bbeaa8f333bd93bf288384b1d998d185. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZS652136713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd517db854445899a8cffc4a5d0d5040d3591cdac28cb58205c4f0d85bfca92. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZS632192259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2631c70278146d2a06ad1d4000289cc0947d8329d995ad43679fa65fb13163. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZS662171659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053a8de705fa6485dad9792e6b5994be5ce2a65e78de0a13fdf06918a7f3e060. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZS662157794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035371362d17197baff09668258047ab01ffcfbf4eadb4fbd0a02b0e7638bb19. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZS662147599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac88a70ce1efcbe3594b670db081830f26a8e63602f3a9972fe18c59e6c0cffc. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZS672194545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d8af5b4cb0347adf6ebda8d8b0c72b1a3ee5d52aecc60a3aa456da67c056ad. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZS642178028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5df41a8b22f0839388b72cd5587dccd4db7eb20749e9585adcb41f83308662f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZS652126326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61aaa2565b26c95954caeaaf0f076a446c4cb86f2a3e62cc798f3787ff9be49. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZS672165161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0b9ec6262d28901db5152d171f114f62627bf63b4016720fdb592cb272fcc6. 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/QZS632155417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e1c06120531c4b82068cb33ab032ed2c02fdd73536d3383a5465506b9896de. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM42K2270448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2728ea04cc26abbca24bace403fc9e02f6163caf206d7280347b57da26a982. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAW2387526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443b62cefc5f14088f307c694b881c84f2c70d8acdc3a9b0ad9a68ff5938622e. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZWFQ2340162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb67e05fd9440312c5f7e207ddf4eef0f9500e3ffdbf75eedd92dc0a7fe1aaae. 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/US3DF2490933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f452e0e9bf4a0f44ab5057762ec44e7dd33653fefce6b9a7609458df402172. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2418571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b5fb47b067780b8592035d7c82fb197d35817e10ad27f2f2f4be4c0107335b. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USANG2424355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45d7a801dfa5069fae7a9b905fe2ea159ecc163b7b379e3811631d8ed7284da. 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/USANG2437169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f4926862c24a5ff65bd2e9b5207d1709e1185e13fe70bcd781bba16f303c14. 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/USANG2467359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336025a2e7478eecdf269ef61efe162b6715fcb0333899e4bb33c0d457ee0c11. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USANG2477817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71e301d615034bd4c8e015c38c348fc5db0c9989966b53a54e1da3631e98dec. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US3DF2500786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508efe9aae748ed9109319c50365b2fb66ad73545b7bffa8b5b20a51e41946e9. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWV2507415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3017139dcf0f435856290f4b7c6fbdaa26433f21246e97df8005fb64cbadd855. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USANG2424217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55723950ca4d66262cb05551c00476c72812697c1958d4dbbba832d4e6ab4401. 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/QZPLS2480203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4437622002300028c9614c0c74a363bfd96317d523aa87ebc8f77d7805e4f8. 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/QZMHM2273062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe163922d52638f710322782f8fcc16eb48d2a8715fefb32b949d3176950b8fa3. 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/QZPEW2437644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e25a1e192d635f03ad64dc9cc88562cf482b359d6cd4ff09a70555ee1ce690. 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/QZNWR2222376.