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 0xfcf711b18de4c4e85e53f8da5fd7a99feb5d6a5d2f38fff68486e71c1be3f126. 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/440112ad-f6ea-470b-9208-91c5baddad82.json and https://artists.proofprofile.net/proofs/artist/440112ad-f6ea-470b-9208-91c5baddad82.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 0x8de164bea7756bc92017e4b8b4fd2185312a19616674bd1c3ea07370d44d23e2. 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/DGA072461474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7214d4ffdc28ca0a01531d330f45d4b51f309bb48aed50ff614aaaf7f623a3ac. 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/HKC992424556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfe5a20f15b7ea9d85580cf935130619889cae648cc3cf3e21e084c320ec880. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZZ972479954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab16250c5cc2e71ae3bef68aeb9b811a293710049f1be88837f36a7fc93fb69. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/DGA0H2389327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab5f7a7655fb27b215003746f549fbe039d8a4641750383b3d12aa54adaacd7. 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/HKG731621356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c3cbcdf91bfa519077cb1320d7f853ad02f7a74cb646fc69453631c52cbac7. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKG731621318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69d40c670ff5de68c55d841c6a6092f9e168e7df7b5047bd5ffb20e39e6e52a. 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/DGA062307072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4ed7a387af01913c64ca428b7563679b2ad566ab0357ce5857ee17c883d99a. 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/HKC992324339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bbd139abbd2f303b9f4ac8f9d5e43dec7334cb20b8a75cdccc210efc8ecdec. 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/HKG732282233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684f5037aa1f01c1b22c4df7f2d73dc8c6a8d86f0c232ce988861a5c9e3cafca. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/HKG732237760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae2c8107b934f2c09e5cfc4592656949f16b9827c8a3fa369a6d8f9b66fe802. 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/HKG732237761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458a39f674b81f01dee45183b629c1db71a36b67780a848159604d9bfde76abd. 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/FR10S2203221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0538ea970cee605334e3014e2ae323ddf33f9ad9fb3a2ace19e16c0ceb031ca2. 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/HKG732122820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7212fdceed2b531d47b8bd69443168bdc90ba92382d752c83ab2db85f8515c7d. 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/HKG732244344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af89fa49c6f23eaf28f9fbd8c8bd975d04f430336089acf77cba84088407248. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKG732132589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8dba8947f7aa2b97dbffdd9c697b818ecbd195208661e90a9a913771b18bfb. 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/HKG732017523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9972b788462e842b45df6cbff645bd825c5e13e59f913b20c73307c826b50ce6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/HKG732017524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9608a6ccd80691697a371836f766a80e8303c0c231880d29d734c95864a70e4e. 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/HKG732017525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3a8b5dd2a57ca9e0f76899e228c9426581f14fc5bebe479ce96dcafbcb4502. 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/HKG732017526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef43a92294d025d62c35d6c4bf0da3a7937e6fff5f22c5e2395f03329f1d135b. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKG731770917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf4f8b5588b1d12307075cd457836f0e68930665f3a86fc3556bb6269925efb. 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/HKG732302384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd718f491d6a8286187db75f73a5e017438525c173d539505db7f7a9239d05f4a. 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/HKG732302413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea815b672e0e6b3b7e52b2ea925ae6ecb98bf1694e9c06d5d136b8ff2a439c3. 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/HKG732302427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deb603756efcc1133abf18d6261335ac163b8ee5128f826601f2047a7b5fce5. 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/HKG732302423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b488e85c3d3c06bd061d36411f0c1f0ab1150add109549f2815bb003398408b. 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/HKG732302425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb292917aeebdad050fe9684bd78692abcf50b13b1ec8c69bd7c28e988a76faba. 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/HKG732302426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0c5f5075e651664bb6aa7ef23bea5a4b3cdd9659ded575e0d7e8a7a501ab5e. 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/FRX282307136.