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 0x2220c8699cd462a16f7c989e65fd70cc91c2d90ab73fb4dcd0482c13d335e273. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4387a8ec-e0d2-4f8e-8e8a-dbc47bf94e0b.json and https://artists.proofprofile.net/proofs/artist/4387a8ec-e0d2-4f8e-8e8a-dbc47bf94e0b.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 0x675f46aaab0f71da3c0a0b6deb17bd0c6ff2f204b519321be05abe80e0160bb8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USHM82026518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76036a3a04543e3fe93dfc84854a9a2d63e04760a21635e8f9c7f76d44bab5e5. 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/QZH5E2341014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8f284102096f6370f438dc20bd4f3f493f8e91e8e762299f5ff0964dd4e66c. 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/QZNWZ2371049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4406cc814b1c93645f00da96e6a1b5160e58f713c48dd51d5086ac9331afe481. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTBB2230846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1ecb75dc75d2627f423d9d20ec88030a4f00ae57b9483b8cc8d811c36f9e9a. 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/QZTB82233627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc061d31f523253e9ee05f00b26a89064765474b1211666703ece70f6125082d9. 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/QZFZ22217153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1df7ca4c15c6b18e1c1b48901523e1f2fb8b6000ef68073ea04900153a27007. 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/QZNWU2191183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bcbf09edffef63264158438c0a1444230aedbb49d2f32f3b1d7699a365aeca. 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/QZK6P2175357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb053ad28ac726fd10ebd4e8341870ef30b224502a00767ac0cf4df417c8f496e. 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/QZNWY2048975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bb33f9d7077a414d9a74b599476f5ded3ec0029587e804d3586e942e6c8fd8. 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/QZNWU2052854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3f0c0153c69aea42cdaa06812cabb06eb4a88cd535939e3b45cc4a98e831a0. 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/QZK6J2010592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ca3335076d0f3b1f492fee8e5416b56f4fd867be53fe78826a1bdcfc561965. 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/QZDA62075133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996c9d31fe020b17bfd184f777a1bcf0976ff4eac6b1f708e3f44eb31205e00a. 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/QZFZ22049701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2cdec89e97e704c518472f6423316091f7e74479a719636348e108200bc348. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFYZ2014525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4560cf95c6ce9c96bcf24ecbe34ddb39f1841b4b6a16486fc599ffb5ca9ceba9. 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/QZK6N1927083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edc69d6b8f234af69897b2820646b0578a8cc75f600df121d9b3519169e0fec. 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/QZJRB1922956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19767302bf0a1a3cf125118d51e4b0281d1b53e299fb595cd4f27303af2fc94. 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/QZHN41917081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15293afa85c0fe4ee6abdb08af884a8406d03e2b6ed25bf6b7aa517b2dceb526. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHN31910367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cab59b07fbc3d38053b4b1b78b1ac0f11f9d46dac64fd1aaecca1f158384b0. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZHN31911089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3c331d5e7c75fa2b03232ca2e5a058ff8c0c97476e34f8bbb056b5166c3163. 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/QZHN31910078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafea119794afd98d6ff88529b3ecef6ec8ada4b9f4e6829e82cab25bfc683ce1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES81945310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824bdd5d7f2b80e4fa6b45840fec838f63fec203c0cff9d29368438350fda9ad. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZES81945220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba31bf828499e44bc118fa115edcdbb928f56b6d54eeb7f62ce05d6490a45baf. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA61970783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014689825eac1e817b55ebfff6db5a371c33c6b7f4b185574cb156633b83987e. 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/QZDA61970710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb895263ddbe0450dcaf9460d94c31ce4620a3d3caad3fc2c2341c384912cff0. 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/QZDA61970712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9944f9ad6e6b8fd96da18e248708ac80cdf2131045cbdc6d9717a8ff2cdf2fe5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZS652293282.