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 0xdba01049e5546517a563192ef668d7d3dd270761caa6cf8160788dfa4c447b8a. 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/cb92e5a6-ac6b-4d4d-b952-4daba7ed68e1.json and https://artists.proofprofile.net/proofs/artist/cb92e5a6-ac6b-4d4d-b952-4daba7ed68e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
French Songs for Children (BilinguaSing Megamix)
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 0x5a50e3c813fa8fc2d4d3db51ebe110095ed31c4d41abdb9ea39255385c819fa4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCADI1713036.
Spanish Songs for Children (BilinguaSing Megamix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdf58ad177c4fa4e676fe8e136c5a5d56497ef1bd12238812699230141d2689. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/TCAFO2105093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec59a497581a4f324d97ea67d6dcadc1ad1b42f84db4229256cdc3f2ced54cf1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCAFO2104910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93e2a80156145373f7dd1e42170fd0d4b85243b8437605e7b73711c1c349f29. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAFO2104952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4592f1a81d3ace1007ba6424415fbdc827daa0aa1fcba93ef18bdda3e2ce54. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAFO2105016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e9a3043675d6cffbe8719985068f0ebb303e6d0d48ea7c6fa41363307ce5fa. 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/TCAFO2105054.
German Songs for Children (BilinguaSing Megamix)
Italian Songs for Children (BilinguaSing Megamix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f52f0db830a1130455feccb0c22c240c13b255e9c5b49984a7bd50fa900476. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWQ2111848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a541861e35ec9eee18df5dc0f3d5e2dd85613be9a61efd6b04374a1ac0c3f1. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZNWQ2111849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc8aaf00faa728452c56aac5a675db735e7a490cdd2df27d061c78918ef25de. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWQ2111850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9902b5d1926755bd340d22b1b0814a497434e817419be5da8a938f5d3e24562. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZNWQ2111851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32369aa0b56582e2fd8984c2c26aad79563e6ca2a8c8b4cdb496cf29d6771565. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNWQ2111852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13da65edb7dfc0a3eba66edeb9cea8cdce45da7256cbc175c51b1eb7654e72fe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWQ2111853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ba01afe8155c8bde6601619ff08225f4213089c35c7b810f7c94031fb987df. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZNWQ2111854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f0c57cf0b5625ec567de89e021039b6978f9ae2346b921132959c8590809cf. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCAFP2115626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0dc4904447307febd048029198f2f9e317fdbd01fb58f56b94488177e2f176. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZNWQ2111855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c08a54fb5ba1a3d04aefd2dcf5b6ecdf2c1609596e2238d7aff7060bec2cbd1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAFP2115600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026eb3aeeae752d0e0254aeb0130b11f8fd692e05d77ef1d85ae81900d64839f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWQ2111858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849df82dce93610883fc77ceb5a146ef635b1ed524823779581c99991d06693b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWQ2111860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204918235aed6428954a0f6d28ac1f6990a48a21c960ed98f365866816f3e11a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWQ2111861.
Bilingual Christmas Songs for Children (BilinguaSing Mix)