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 0x7043b96f50f661a8529cd02f94018832ef393292d8e7abdc33777a42375c917e. 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/94b4fd11-bb3a-4d7b-a64b-c3475d0028db.json and https://artists.proofprofile.net/proofs/artist/94b4fd11-bb3a-4d7b-a64b-c3475d0028db.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 0x9219e0630420da523f36872c8f2f4746d69bc4943bf6c79469f85dddb94618f8. 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/QZDQH2376207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e39e4f42fe9b8dc4221fec91b4668595768368609a3775293a4fa7bbdf51353. 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/US3DF2479060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5af89c44f8bb77df94ff58a1a984449522b540017da23847e7d507b8c49cc73. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:11:50Z), 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/QZDQH2419469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bdfdf59bea768d99f47a025ff1b02a234ddfa783ec92d9b1554da12b6f9d2f. 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/QZDQH2419474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77d6ba532e6c040c91252924c49206a847f85fd380467e604a6a8ef261377d6. 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/QZDQH2419476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7510ac72242bfeed2eb9a193001e4f7676b7f783cb727a71e2bfde9c34830a. 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/MX2832138567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4b9c26294ef5848266b0f15d68c1bf280837b4f1fb40f99d80e90830736f92. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/US7VG1981974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303887c18fcc6f1702ddf5913aed28e2ccda7a1424bd6484470d6dc9f4a92c70. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/US7VG1863190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9212b2727227f985490ac076d579d2801e98f62af8a7f272d4a6200570f4e42f. 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/QZ5AB1920126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4270393ea4b7111a04eeff410aedf02427c083b58bb7e8631b87609fff9d1dd. 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/QZ5AB1920127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1abc664af74bbd36e6673f3e0b1dcc93e9bd93baea1a3927a477ec289606f7c. 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/QZ5AB1920128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0771f01631337ffe0b8eddcda2e62b89007664be277a4f6ba86160344b948dc9. 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/QZ5AB1920133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04832250d5ad1c75a22e512061bc05af71e25ed8a22e2911045814f0ca0ba450. 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/QZ5AB1920134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd334468a7cf8a196caf069c6b27bd79685264059d9ac7e7791a0d1f1d364e0. 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/QZ5AB1920136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cfe088933a3e8f51b9a4ba326d0d64533995d39e6b2b5b5e6c3e15203fae65. 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/QZDQH2511031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e33fb8c677b37f21f074ae5aa0b8e047a133d4ee430f451a32be20585299fd. 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/QZDQH2506942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f2618e107c7ddb68867b245c198bbb57a21bd88b24051fd1f35a1376540843. 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/QZDQH2505413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7ce6b01ab65508891502e18dff94311a41c4e4620a3c8ac2061e3b9961de83. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZDQH2440167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b1f2bd0acf605f7268ed050f7ee76c1fa4277f390f1434cca6e7bc5fac4553. 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/QZDQH2437688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65321f3e1ffda2127921980148ddb13759ea46c468cdaac971069ea54866d68e. 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/QZDQH2434218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f3172d8a65c76943751f3f142b0c107b1ecf26f0ccce48b0f76a8f77e4c14e. 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/QZDQH2432447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f4b8fd295717dc79b3e53f3940d02e78461cd09c8ee69c55290596c79fd529. 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/TCAIA2419073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7834b8db87555bac67c48e74d8157986fd7814a2eab07733abff9e56cc1ce532. 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/QZNJX2332933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3d9b9d3b8e0a458482fc9356433a62bec608302f258d1b221dac05312389a9. 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/QZNJW2354401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28018866efe5493b6bef17c4423d9996e26e858d4d36ec1d954aa703a257420. 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/QZGLS2393769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17572ce41423982768f61943e2ef48d4f32644433d92e01433b11f6ea5f57dd6. 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/QZNJV2441453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f3015ab1506b593ad8f3c3bb1b329c9a9d1692ee1e5b28f4bf8484ee6ecede. 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/QZNJY2441092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac7b4d0d3ee733844944535eecc83143a563606b83510f25323acadcdb357b8. 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/QZNJX2460146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743ed52b16ead2b261c2c679dd1b3d2e86acde62bf7e1e3a733b261d893b1edc. 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/QZNJX2497280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e73e4a72ee2e4165a40f08726d63f1bc16635ba4fb32fa18f8d458517efbf6. 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/QZNJV2498178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddebbf118ef59b32dbc03f8b87b0932b5f1cd00e61045943eb8aef2eaa1993c2. 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/QZNJW2442850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e272f4019f183ea298858145de0ee81f1ba0d80e1f0b46c0c925c6bccca5c6e. 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/QZWFT2599269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acd8968bf860ecc8548a52f3abd960875902e0b0c494c16c1520f27d990991a. 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/QZTB62533616.