thumb|Old turnstiles at Alewife station on the MBTA Red Line in Cambridge, MA, U.S. A turnstile (also called a gateline, baffle gate, automated gate, turn gate in some regions) is a form of gate which
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8768522874b68943f6f9c7a2a350820358d390cb6a2a21d5c23c960a5b6b9288. 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/519ee7d6-bd3a-4e66-8930-d203eafc9dfb.json and https://artists.proofprofile.net/proofs/artist/519ee7d6-bd3a-4e66-8930-d203eafc9dfb.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88373a6cf2b302c5794495035e2a60f549ca39d2e9b07160a444db44fb02f8a. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NLA321700308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62697ede281ada24ad3eb02dffdfa2244f4c9fe714802dc913f9a19d6f0a0bd6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/NLA321700344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b78ac8cce5c27cc9da2f36c9ed8163f91e852f4a5eb21c9d11d1cc906785a6. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/NLA321700347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ffc6303bc3344575fffd7b3334839cd82aa0c5bd348fb7bc8c2ab3945e45d4. 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/NLO112100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43abbcca443a27aafbf2d0636961bec625e1948ee30d7d74cf04d8e1624f79ab. 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/NLA322100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4061f81d27d2a4e01d068b3a213a191d371046553a36b7be16c9e8453669234. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NLA322100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4061f81d27d2a4e01d068b3a213a191d371046553a36b7be16c9e8453669234. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLA322100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc174b603b7f7b32c696b7b960ce97d6618b74f01d8b108e1c4de402cdcfe43. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLA322100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e8e69bdb977ea80ff9e7230f841dd7da874c11b7f8daa6d5d9d0d15e96d7c8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLA322100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162b8f2b4217ba36d1b9c67e4ab15cd8a1a794d81cd2a96438bdf2126eb76fea. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NLA322100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4061f81d27d2a4e01d068b3a213a191d371046553a36b7be16c9e8453669234. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/NLA322100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe76a1ebb2e3c7c5542ca3d9c2c03979eddea996da17a21b0977b8d1705a0a4. 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/NLA322100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc174b603b7f7b32c696b7b960ce97d6618b74f01d8b108e1c4de402cdcfe43. 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/NLA322100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e8e69bdb977ea80ff9e7230f841dd7da874c11b7f8daa6d5d9d0d15e96d7c8. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLA322100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc174b603b7f7b32c696b7b960ce97d6618b74f01d8b108e1c4de402cdcfe43. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162b8f2b4217ba36d1b9c67e4ab15cd8a1a794d81cd2a96438bdf2126eb76fea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4400ff825f01d71723259461f04bfe8696f3a5061006766bfe526ea307272027. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a10590583e21d01811b65880cfc6f6357a6c9840b3fa5c6377997807ea015c5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4061f81d27d2a4e01d068b3a213a191d371046553a36b7be16c9e8453669234. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c1996b70fa074050c31cf755e61050f53cbc0c08e90c0292aa597ba3ccd513. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA322100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ec99011b5a148365f12b778dd4cb866d901b1ddc43fd4ff55586d3206cad6e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1cccc0c74f9152dda94f40cf708138c3baddeb08acd779285143b3fa9209529. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43abbcca443a27aafbf2d0636961bec625e1948ee30d7d74cf04d8e1624f79ab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ba60071ecc84ee66f29c46372a24614836f421eb8ca3910f8f844d7b1a0266. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bc4bdd5ec86e3b7f74f1a3dfb87b01380d4b43366b86d545937e7ad5e0e4d8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA322100059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac076243aab4fd679ce0f20f346a6901ceaab18e31913b6388c65ba9bcbe141. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA322100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e8e69bdb977ea80ff9e7230f841dd7da874c11b7f8daa6d5d9d0d15e96d7c8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe76a1ebb2e3c7c5542ca3d9c2c03979eddea996da17a21b0977b8d1705a0a4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7648fe60536ecca7969e4f7b0474f334356dd2ae3e00cdeccd2e4f1d1bd2f803. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLA322100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a1c69696d7b5de916a46dd2d54b81115b90c2311b4a746c90cbd513faa8638. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322300133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1079fd09051943bf0c284fa851729fb464fe7fa94cbef9fa0c244c0b5390be87. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA322300136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00107b8089f29625ed2c940f6582fa1906843b776c5fc423db808f8995ed62e2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA322300134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38943a3271c5907635d6010494d8c235248dc8129f2fe53135b4c243c65ab5b2. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLO112500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162b8f2b4217ba36d1b9c67e4ab15cd8a1a794d81cd2a96438bdf2126eb76fea. 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/NLA322100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1079fd09051943bf0c284fa851729fb464fe7fa94cbef9fa0c244c0b5390be87. 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/NLA322300136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1079fd09051943bf0c284fa851729fb464fe7fa94cbef9fa0c244c0b5390be87. 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/NLA322300136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1079fd09051943bf0c284fa851729fb464fe7fa94cbef9fa0c244c0b5390be87. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA322300136.