thumb|A toy motor scooter from 1955 A toy or plaything is an object that is used primarily to provide entertainment. Simple examples include toy blocks, board games, and dolls. Toys are often designed
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 0x2e747766c32878af2fac376226f4debc16cc93a7e52f49c0ccec220c83c4bb85. 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/2a6ea72a-9b27-40f6-99ce-6a226e0ba185.json and https://artists.proofprofile.net/proofs/artist/2a6ea72a-9b27-40f6-99ce-6a226e0ba185.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 0xa7cb9937c65ac8ebc76b413798fc3782a47e7667d4ead20bc4feefb33faecb1f. 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/KRA341503967.
Um Homem E Uma Mulher (with Dawn Bishop)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bf5353c0bcf43eb2c2d34c9954c6bb42149e47c2b19637d8e8b2a8b6471229. 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/KRA341503972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9186fcf7b7e2fd09486325d38ad9d8fa054e7923b2f1f1e118765d5da97ae00c. 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/KRA341503973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30589b97071e80ec2c5abe0257ab180cb2e56da2e24a0c9947e61720dbc4988c. 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/KRA491402322.
Goodbye sun, Goodbye moon (With Lee SUHYUN)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f05aa1c207d0090d7ee5d8d4ed868774eeb62734a68fd03011bd10608fe603f. 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/KRA491402323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48703b1207e9277ce6507cb30123b613aaa41d278731180488d10f2bf86cc2bb. 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/KRA491402324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6d4615813dc3509a95719e51be05073045f349a9050d858bff128fb4f2303b. 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/KRA491402325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891ac42c0ce6de5a835024e5d7f716bebcbb5835c046fcf0968a219d2613c91d. 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/KRA491402326.
Life is Beautiful (With Dynamicduo & Zion T & Crush)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfdbf4d1677c588cf4d1c391453c845f4e50d5b87a198c8c1b34aeabcd81aa7. 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/KRA491402327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04999f25192ae80aa3a69ce9cddf79c9faca1e16406fcfaaff05e3f4c6acadd. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRA491402328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4254bcf928dac60c7238b6ad4ba4a9025d6a2542260bdc2224a2efba2595449. 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/KRA491402329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9189abdb957a1e356682e5ad47484052f6e41d440a15ef930f50217235b1cac. 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/KRA491402330.
Always Being Strangers (With Sunwoojunga)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a6a35484782be04f3688745a175594fba7d464040b58d4d24c4fc30d7778b9. 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/KRA491402331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81a0ef40d1b5f79b53ccae8054e70bb53afb273749bd8b99b55e162520f7aac. 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/KRA491402332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980ac93a20349e3bdb86b64af720185a0c178a324b4e51fbf38eacb362227118. 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/KRA491402321.
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 0x3c0716ec9661160d97a758a60bda80d8674b1f7f00ad7a217db0c7ed9cc115df. 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/KRA491402333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21acd7399c70f94e9fecf8624c0a9d218a066cc07fcfc6369c098207c49ee032. 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/KRF681801124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4584b375fd893752d97c835fc59a4c6706cc458b9c27624b7b5d7e3d4cef5700. 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/KRF681801125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8905d6890e6f77fbdda42aabd7ca8f104f0cabaaad5f48e1fa72fab8fe1fe807. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRF681801127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f52367da0fe9aacaa7439704d442ff7374439da30e7511757b327917dcf2e4. 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/KRF681801128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d48110d8902bcccd561beaff6c66da090a60005cd8b869496c975e0dedebc7. 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/KRF681801129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc555fc9ba0258fcb148d2bd625b0624ff2719ec44dd460b860a317367dc3fbc3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/KRF681801126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cc78f21fec8a853b99cee7c917b05e6002959d8c9e4942fd17c43c2d53e4b0. 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/KRF681801130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3c43f4e3ee176531b22ff07d41466129c82ec8e2164a6a67099e61fbf06025. 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/KRF681801131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9edcbf07ca6bee64e2fbb9fb86eb5466264f09d81f528359b753abe95beb29. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/KRF681801132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe409181291b67f0406be32688cba25ff797d92caabffbdb35a7ddd127004ecd. 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/KRA341503837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3f539ea653901708af269b806f6f2b824fcee945c20f220e059782e54bc0e9. 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/KRA341503838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8fd8571f5b9086e9effb2b10f43004b33771dfa857357540f61a5ac9718dc7. 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/KRA341503842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb32fe7bd2a190e817c6ca77ab3316e9552f12786e6efd9fa53aeaa50aad3257. 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/KRA341503843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde32cb6a9488e8779a08bcf9fa23a4a52c6c6b47cf575abdcab351de7f366be2. 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/KRA341503844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201fcbbf6143830e191daf33356db66946bf44e46e17bbee7b5704e195f71a5c. 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/KRA341503846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa573840749144775ccb1b6077a5900046dc48aecfbefb5513910c3a72450c1ea. 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/KRA341503847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e976d1e37d50c6fe49ba34b8110dc2a48026f398bf4d59dd8b461c5faed50e1. 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/KRA341503848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed0f068f5ebbca26fe12cbd0d1e44d27b9922f97270b622e48e374fb820f6d1. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/KRA341503849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9762de8fae61110d8b758fd98dcdb4176e42c0b24ed141bcedd16ae00ed5298. 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/KRA382001359.