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 0x94753ce67450b483d4a2585a009ebb290bb3ab9f3879ebb9822018938d3e380e. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f2a24dc-e62a-4daf-8acd-96b7a1add488.json and https://artists.proofprofile.net/proofs/artist/4f2a24dc-e62a-4daf-8acd-96b7a1add488.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 0x2c9cf1c7cb5e1ac79f5943cf5b24985512219103ea56d1f3f42734aa62aca961. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/HKB529700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9cf1c7cb5e1ac79f5943cf5b24985512219103ea56d1f3f42734aa62aca961. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/HKB529700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1af7105264123d1ed85928bc8f79cf1a2d5ce76f8041be3ccdffe136442d30. 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/HKB529700183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ec9586b5599df3300e2680d184b083da78ab358b2aee72bb6ae4dd276c596f. 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/HKB529700194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9cf1c7cb5e1ac79f5943cf5b24985512219103ea56d1f3f42734aa62aca961. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/HKB529700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a9be69065be927271f3238110871138b525d539b610552e6418c8d28d7ff12. 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/HKB529700182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d8ce31b526d5975ce5225846b2fe7410dcad8a1532bcc2388cc9ace4b44fce. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HKB529700192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749d1a2ce2569d959bac23dc04ddd1eb4419ed6f45fc0c61d291036536db0bb6. 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/HKB529700195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d51d3b4cebfe451de06f15f966e73f8990a936726e48639f04814398be79b3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKB529700181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d212aa2e6927821c2f23406d5de277fed131aa404d5756f8b337c9e5bd7bb94. 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/HKB529700190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec6c7cdd6441ceaa5ff604a25045e1f8eabca3fa449f33acaacedb36a139672. 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/HKB529700189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfa688d14783a89afd458904150b26e8c45f39fafa1eb95ba4861f3e5f150dc. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HKB529700177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1794a841b2eafe16d98ccad4d9f65bfd4c53a194461cac4b022d103745502440. 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/HKB529700184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9878d29628fcfedb93eaa716268b1f16114aae443b584422a80b468b5a087ca. 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/HKB529700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec6c7cdd6441ceaa5ff604a25045e1f8eabca3fa449f33acaacedb36a139672. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HKB529700189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32839460a89f2f0cc0aa6e5658497bef26fdf65b95f59b857814f01b8605620e. 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/HKB529700196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef07021dda27a1a45f6fc0f34609b8a797f6ac052f851bf2868fe6cc7bdb2f5. 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/HKB529700197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58bf4f7c9cbf7f5237177306e1cb558a1b645159e81e4c629f09ceb098b7106. 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/HKB529700203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ca2d0a220366ec63e8f4665a77f02c58dea97c0fcb42cd9404842632e983e4. 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/HKB529700174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32839460a89f2f0cc0aa6e5658497bef26fdf65b95f59b857814f01b8605620e. 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/HKB529700196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2eb6e7ae524b574e5ac17108b2557f1317b26cf08a38993b172fc8c04f924e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/HKB529700180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ca9a028db7f5338f5018c0ee6f5414ddb82179ac31e7150e55f884298a3a3c. 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/HKB528300564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef07021dda27a1a45f6fc0f34609b8a797f6ac052f851bf2868fe6cc7bdb2f5. 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/HKB529700197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58bf4f7c9cbf7f5237177306e1cb558a1b645159e81e4c629f09ceb098b7106. 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/HKB529700203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044af67ae99e7262af5575bb53cd8d1d210d51d29b80dd3db6f4c218a599f1a0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKB529800235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec171438124ad062a07756fe68c1f0d7e2aea6037fbcb574139536eb20c8230. 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/HKB529700176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1af7105264123d1ed85928bc8f79cf1a2d5ce76f8041be3ccdffe136442d30. 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/HKB529700183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a3498bf3f5f860e97772ded61ea36ca98d3ce07efd7256c2f7e6d17d71cf72. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/HKB528000554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ca2d0a220366ec63e8f4665a77f02c58dea97c0fcb42cd9404842632e983e4. 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/HKB529700174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67343a1115a67c526c3feb6b9f9aa8586a7ff245d77b091a23408fe2e607e3c. 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/HKB528500575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ca2d0a220366ec63e8f4665a77f02c58dea97c0fcb42cd9404842632e983e4. 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/HKB529700174.