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 0xaecbf671874033239794fd2b34aa17afa71ceaa04b557085cd4d5ba945d24b58. 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/105ada8c-bef4-4851-a520-b06d4f879234.json and https://artists.proofprofile.net/proofs/artist/105ada8c-bef4-4851-a520-b06d4f879234.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 0x9542e1736d3a478b83b30c2d4e2721b5e08f65efcdec41eb927354599eefea5a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES72194718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe76389b8a7cf0e77695e23fca2374685ab89e77e3062135b32813758654c91. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6P2122325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3a283cab2bb5cc147e0c318e70800d9f2813efd3a010dd22f4628dbaabff47. 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/QZRP42116526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1a396d2db47a177025697f0d2f441c95b41d9de7e550e4f67d29d982c90118. 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/QZTAY2279470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846d4eed1513cd6e0884cf28134be8f23dcfc68bb623af5e57ab1625fbed0958. 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/QZTB22469153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885695871caa98089d34d6dd1312bd59d89bbfc43457f4d4b0e5abda1015e992. 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/QZZ792412127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8c96b53f6858a2a40070b2c9101a1dce910af21424fab58a4db5ede4605bf3. 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/QZZ7P2400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eaf81e4cb5f502903c4177389b332290d379a096f0f44be876487c27a4fc6e8. 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/QZZ7P2403484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b888cbeeb63f8156fa1aac5a9e91c1ce5e52d5325af39e77ae73352e651ec4a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7W2480599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf377006d3d0cb69c01a517e62385f0e3aa47fc536cb5fa6b9995faf41730c1b9. 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/QZES52593219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b86fc7943334ada41f4986daca69c96c989f673954d4a0c13ffa41eee70f3e8. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZES62567137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00a8ddcb3e83aee642eb576d09961a4c1ba7f764b980113eec38c9d04b70b87. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZHN32562568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8843dd5069ef1a46d2cb44a4cbcc3ea9949522d3f3d8ea3ebdd3e070a0b4dc. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZK6L2589353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57c637490cef8992d36ea2b4a61c53d5c2e87eada8a69a383e844ebf06140bc. 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/QZK6J2518218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9244f4036c91d775121d1f0d361727e05bbe155b02cba9b3ccd51f79b75766. 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/QZPLR2550673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359e6866323102c468ed0e052f8944cd66feb4e0c998b9fbba2d431392e7bd58. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZWFS2586727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47564d452dc232bd43f144ec6946b9f2d4893b1fe46a4fb8823939f92fe7ad3. 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/QZZ7K2587955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a12a0cdd514e91662010a87f5d97aac33509cd443d32d1812f384ee88062fc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZS7J2586251.