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 0xf7b0bf8e8e89f1cbfb1e0c67c4d4fcfa4e5c981430200e35ea0bafe24f457d79. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74816c5e-50f2-4c9f-b4e2-d8b9f1c343cf.json and https://artists.proofprofile.net/proofs/artist/74816c5e-50f2-4c9f-b4e2-d8b9f1c343cf.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 0xa1e4897d21f768a27c4d7dcfbf8abef07cacb65c49dfe769ef2fadc0e1804aba. 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/USHM22129359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30fccfa49af459d78b98737385f04fef4bc8458a5b51172a5d934e618595078. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USL4R2107012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aff4ebf47099465a84c111f0c747ae95ae6a9f52d7f1e9ebf1b50727291cf8c. 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/USHM82145958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a3a8c4a6dc18725e72a133af914ec6b96919a0738e9a5fe268569484bf336c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USCGJ2277756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c00019304a9212aff9d0b9575926b3ca68f50aa6be832cc260651845ef3dfdc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH2213623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c999e3ec490134929b31384ca5e43234f3f0fec171f28dbb7dc7a500878a221. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USHM82193369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbf469940e5f5554a95099de97e86753c0ba6ef97501e2cf5d3dbf3cbaf5d4a. 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/USCGJ2202251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc5a92aea4c2b6e2104bed3545073b0dce1a0d40443f77bde7ea8a021cefa30. 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/USCGJ2277757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e271a2506e3b8730d5d3a7430e13c93f5e8beeccb85a10c7386ab2577b19412. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USX9P2001497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c91d01814a149f374ef75de7fff1cb4f0b7adb70de5bcea1b0c26c7128eefe. 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/USX9P2001498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a7f9c23fe5ba959bb08c8757db0eb2eb2a0ac422586610357780dc78ee29ee. 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/USL4Q2096194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968c78115afc2e8573c5491a6274e4c6f96dcb9dce60f72e499fc2f74cbe7648. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USX9P2001499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe093a02f2d86dfd3b888f4078a8bb6c8c337cd7fd82782053924e06db712045. 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/USX9P2001500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe41b10144ea05dd46c35bde27ea580302045a97ae27fa4188b226d2a0f1a0bf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USCGJ1936305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a30c7f1b56a060e7c1b17eeecd762ef94316f4b6d1869888b006bd924ff919. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USCGJ1936306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190c0477c803ef4911de38810491a92967ba686a1cb68da8c6a00e6d0d98f669. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USCGJ1936308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd167d66fb1a1d054c02f669b220918126c69fe232edf51bf204eab2330098ca3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USCGJ1936309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31d4dd98feed852bb26f2aa180b52f6a7b764622b9059f37d168bc680a02439. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USCGJ1936310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4ecc2679fa1bf4a7ca6523adc32c4462f69cfb52ff5765bf08cc82a9e44b0f. 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/USCGJ1936311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2865f4134978b1a67f8030429f75da78b93c770820d2982af775e2a953d29e9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USDY42470629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28adb5a3c09c0b02fa85502eb066b4bff32fc6f3919b8041e76d5c8207841040. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USX9P2374267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631531c8c6e9802f50a7c95d4de4d923df939b4f6e8e799aea6b81c648317c5f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USL4R2359946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8094d0b8bb80c7754adaaf53beb6b53c4cdf8c887986f87c3bc418df266a23b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/AUMEV2361049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5676cbfb4b9bb974556cb8b66cdf5c46a2e94adfc748f94d8a4dd9b53f7d4b5d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USDY42355132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5960f8f9b844b9a64270b9ed650858b3b3094f74c135624c1e4995217c7421. 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/USL4Q2208097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbf469940e5f5554a95099de97e86753c0ba6ef97501e2cf5d3dbf3cbaf5d4a. 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/USCGJ2202251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30fccfa49af459d78b98737385f04fef4bc8458a5b51172a5d934e618595078. 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/USL4R2107012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aff4ebf47099465a84c111f0c747ae95ae6a9f52d7f1e9ebf1b50727291cf8c. 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/USHM82145958.