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 0x7f58c006da9def5598c08fc9ea7823bb6291b5428a488f79b1553f690a363754. 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/5c238501-3923-4e8b-8c2d-46a3749f306b.json and https://artists.proofprofile.net/proofs/artist/5c238501-3923-4e8b-8c2d-46a3749f306b.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 0x5e40d3336ad6c69015f506d245bdf942f101b2880071db184351cd5e2da61be2. 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/USU371700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96a08097824f36abdc6c2742cbb1da3c5af8e703c7540e0c9f0f4e54233998b. 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/USU372500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a199f3b3c8e9ae21e395db520232ec3e2e984b73618142271d55a3467b4b0e9. 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/USU372500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14347f4229836da849ed4129b6a22e7babcc074e60545ee6a483dd7c18417bd. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USU371800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4090d67f34feb1523624da5c4655a40fbfa5a52466c71fe0a39a4489cf39c860. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USU372500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d9355588cb7967b4280bc041a3e7536044ce4c98e96f24b537f42df3d3be8b. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USU372500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55211318ea33286a284f561f301462d74aa2ad42fe95a0ec49d5fd33f155476b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USU372500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfba23cecd0cd94e922863ef5eeb2e300437b172c33f9210aa44d2d644a5e3fe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USU371700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db16deb8a28f5b45da463ddc9645dc1a63f309c2e6bd365f4751fce6be139f7. 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/USU372500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50a1aefe944ff671d7c530b86d191a32bebb157858ec7a43a48df5157685cb3. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USU372500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92dd2e96f1cc59df1b3ce366ca5da932991ded97418a24d24b64ecb250f5bc7. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/USU372500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c39d108b3fa936fe2793858eae0ebb26f6c08426c16cecbe3ec7d9c0c14583a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USU372500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa343560f4e896a5376dd95c912ed18e91afbe7431730c450af7fd21065b44b61. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USU372500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadf33527c8b1aeedc3cd5166c6c9940b01d07d9c5efcc6331ed85ccce1a8bec. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/USU372500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f6f102fcece462de0e71f54a0ba12aaee1fef3b1692ea4276029d3f58e2567. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USU372500015.