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 0xf1f5f0f1e3185169e6da874d1620f664d50031773763490a9e60d8d1b1e6864a. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dce2b153-8416-4f70-912e-1e6895f1813d.json and https://artists.proofprofile.net/proofs/artist/dce2b153-8416-4f70-912e-1e6895f1813d.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 0xad59f590d40e1ffe1d6b52a18641a9d8fd17626de9868ddf77958e553511dc20. 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/USA560521947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd0c066c5b604d5311091678caad87cd0ba6e2794f69a4737495b7298b491f9. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USA560521948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d588ddd43b66ba40af8b1c0612dad159d442350cc1458fb4efd16bea2ae5dbe. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USA560521949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bf26895c8bcc3fd1e7db8d55d64a3d4aca5c57d8aa70818ac0f94668305ab0. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USA560521950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fa177f1c6e421c9666aca0eed45ecbb990fe4cf5e52e8fba597fb44da5f436. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USA560521951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d99218ffc4cac886b66e6b4887cafa9e725a4aab6d2aeb0e8a37d89c8f94aa. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USA560521952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04882edbace309bc479d49c52c517a2424b2727e6ad2dcc278e3414528fddbee. 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/USA560521953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58856892ddc143674e130a5dd01f492956ac23b2e67583b493d36ddd9ac2281b. 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/USA560521954.
Hein spielt abends so schön auf dem Schifferklavier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e1de775611f683c73ce558dd800ad25d18cc59bc0970294dcd665558302791. 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/USA560521955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe748a4cec75a85f2b7a5c69b82759e6f651d9d00a2a3568323dc5f196b9b679b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USA560521957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43795817db09887b8a4d25575e4f9cd9932c0ecb7a557541128c60e9c8c674a2. 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/USA560521958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21be7230771d23032bb0e8c5f1c46b4b2ac2ca667990c72adfdae177d589e25. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USA560521959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b526a169736ac829e34eaab107b5f8c91e144302a37c47101c2562cb4dc1073. 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/USA560521960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3691517ec0521a2131a01b1000e1891816d59ae17c8bea33b95e92371a6ba075. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USA560521961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0139a85e7ef3d54e5e5aa3ce3a65762dff8a3d5a80e899c1b3bdcf14d1d556. 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/USA560521878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851309ab35ea4945738b918f09baac55fe0b5d9948406a9fb18a0f8fdff567df. 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/USA560521879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53f553770b90c7209721be64897b8e6805fea29c79f2bd50fbe827d74b89c5a. 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/USA560521880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a8cd76724ac3f2a760938d81a28c67b3515c94f180ec9912cb255dd72bc26d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USA560521881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd559710252bc2c6d550b0964e5697664169750284391426a7c3089200c66e75c. 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/USA560521882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf46ccd800f279ee62e63b5d15ab2f44c61aa51b2b14a5e8adeb94e7d21dbb8. 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/USA560521883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401817e693cf3a831836cebb7dd7fe0eb9bacc11b0b3ad88026964cd0afaa9c1. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USA560521884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1dfc7e9b06a1daff9e7fd7a35ba93c7d7728b3235e1a300a666ab55579ef820. 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/USA560521885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebcd53c069446a757093ea4767e93e1c70a58caecb69ff45352098f8eea5d0d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USA560521886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c2aa5bdc8e12b20f7f3ce30628a9299731a1466a89e83fae4e163d7014de32. 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/USA560521887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30602def41a53b71106dfa838fcb2d7829841e845f4e2482c1b16295b1120e8d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USA560521888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea84c6c8fdc102179d1a8f4bfe8c5f29091605d243b142bf44fa77b30cc812e1. 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/USA560521889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7e300c0338590938d21ae3d6e05bdd547e5b672be0e27fb66000bf73361d7d. 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/USA560521890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998f91c5592383d63ac485a1939300d5b9b6ff6399bb499e242922b03bfc7785. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USA560521891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9ae0fe6df8e8c72e5db4218888b813f88526d4586bc3c4102a7a0731e6614a. 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/USA560521892.