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 0xdc613cdcfe7e4777036ca03a714200a1448f07009cbe4218cdcdeb6a3702e35a. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4948e3a-eeab-4ac7-a640-a67c0059ef6e.json and https://artists.proofprofile.net/proofs/artist/f4948e3a-eeab-4ac7-a640-a67c0059ef6e.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 0x74ea3ab9369fc0b34bc647e596fa6ea70a65cb7efc3351816e744f184b7bb081. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZMEM2442483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875167451619e7a195078f871b9c3cafe0eaec3c28b40500938e39cf06470199. 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/QZDA62348608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94e4fd4d215551622861e864f6eff96673e8dc02a9d6420153ea23af1df8388. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHN92207418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628054be2aa6ba84494c9fcc0505ee3f00a6d352ccbaf90adb0fedbfa0071165. 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/QZHNB2470926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90413e9bcc850be0c8277f8802021e7d80938e03d23ac7e47f27196f83a4f39. 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/QZTB82310385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabe2ebd33efa5a049629bd3ca59833f9b67bc96d5310062fc95d970616a41d2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZMER2320990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e13c5ec1e7f29100070f92631b6c479afd467184c810947c03dff79d222637. 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/QZNWX2469370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561543386f208e19a3a82dd078687a8d130156497f91a5d07a6b2cb577be5f4a. 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/QZMEP2252092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2f7e047a0ca56d3c180bc8dbd38afb43910edc830a63a26ea6824a6989525b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZTAZ2484369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637e8a44d690842d76fd611fa2ae0eb5291c1cad710f801a6c5e3ffae2d9d750. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QZWFE2354009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28781e95ad4a0a82c517f099342f0424a2f4cce1b3aa10ddea986a6e7eed306c. 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/QZTBA2281948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd18aa0199d3faf29778ffcba5253fdb7056413ac7a01ffda96a5d3a5af65812. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZRP52213740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c67ec4f7d06d31bb4b83a4a56966f719ff71a71d8ae0cf17d17815233a50bc. 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/QZNWX2250090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea3274d794dfbf77b6f88ae235a9791aae19aa4a289e012ac58c58ed25b90f6. 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/QZNWX2252005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189ea54644960dea4edff95a55bfa9f3fff8ffc5adac7b48bfcbdb864b0786f3. 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/QZMEN2205645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2a91f1fd7a60028c966e551bf913f91dde89b9128ba877abcd9ccfa4f447ab. 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/TCAGE2210243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3f04a3f4ab9b262b4b26a3f4a0f74be04012f14d15edee46b688253c4bb190. 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/TCAGE2210251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7409f63e18cb848eed66eaec9de6c7a6286c069ab587e7518431acf1c5f968. 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/TCAGE2210246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29ce4fdc5458391426b17ba2a37588f5a1acc5b55e167890429d6e39d4c308f. 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/TCAGE2210254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ce2ab8a4017a7f215a1394163ec6d8f5af0d547dd781fa86bd9f3fc8d00739. 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/TCAGE2210262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719ad111067f8bf93739bfc7e0c9deb43e06d500579b880d925e979f05860e7d. 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/TCAGE2210265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769ca804dd2565226d1f8f29a4ffbf627c0882210398f67bf68fb0a5ecd0e182. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAGE2210268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c55f41a070aeb088ac07a2a23ea8bb74e2355ae040f1ba5a3ce96ac9ba0436. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCAGE2210276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd7bb3f7a09431a6e8ef6caa2623625e18915c08e6f088e19c7fa3614928b90. 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/TCAGE2210291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52de0e757c6ff74db481ae1b43a041767061a2c43a12b47bd9f803cae61a87fc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAGE2210337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafcd007ba72ef775cec703de4f82d0ac69c454543313aeb8ac828bf7d644c5a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAGE2210360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbe605fdbdd0da981e27491374f5f268dbf36ea469cc5fe8edad70f259b20b2. 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/TCAGE2210339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583851b2e3a8b3cee951c6f6d97de1c0ee8bfad366eab3e3f1f6336223b775ff. 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/TCAER2093568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89fb1f4af4f2208799d3defce48914e8c38e9cc7e365d91af429c19f63bb724. 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/QT3EX2427811.